Add files via upload

Scripts/Synthetic_Data_Generator/SDG_2.py

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+#!/usr/bin/env python3
+import tkinter as tk
+from tkinter import ttk, messagebox, filedialog
+import uuid
+import random
+import csv
+import math
+
+# ---------- Helper functions ----------
+def new_col_id():
+    return str(uuid.uuid4())
+
+def clamp(v, a, b):
+    return max(a, min(b, v))
+
+def format_decimals(dec):
+    return f"0.{''.join(['0']*dec)}" if dec>0 else "0"
+
+# ---------- Column model ----------
+class Column:
+    def __init__(self, name="col", col_id=None):
+        self.id = col_id or new_col_id()
+        self.name = name
+        self.type = "Random"   # or "Fixed"
+        self.min = 0.0
+        self.max = 10.0
+        self.fixed = 0.0
+        self.decimals = 0
+        self.linearity = {
+            "enabled": False,
+            "target_id": None,
+            "weight": 0.0
+        }
+
+    def range_min(self):
+        if self.type == "Random":
+            return float(self.min)
+        else:
+            return float(self.fixed)
+
+    def range_max(self):
+        if self.type == "Random":
+            return float(self.max)
+        else:
+            return float(self.fixed)
+
+# ---------- Main App ----------
+class SyntheticDataGUI(tk.Tk):
+    def __init__(self):
+        super().__init__()
+        self.title("Synthetic Data Generator v1.0")
+        self.geometry("920x800")  # Increased height to accommodate preview table
+        self.minsize(800, 600)
+
+        self.columns = []  # list[Column]
+        # start with 2 sample columns
+        self.add_column("A")
+        self.add_column("B")
+
+        self._build_ui()
+
+    # ---------- UI building ----------
+    def _build_ui(self):
+        # Create main paned window for resizable sections
+        main_pane = ttk.PanedWindow(self, orient=tk.VERTICAL)
+        main_pane.pack(fill=tk.BOTH, expand=True, padx=8, pady=6)
+
+        # Top frame: controls and column definitions
+        top_frame = ttk.Frame(main_pane)
+        main_pane.add(top_frame, weight=1)
+
+        # top frame: controls
+        top = ttk.Frame(top_frame)
+        top.pack(side="top", fill="x", padx=8, pady=6)
+
+        add_btn = ttk.Button(top, text="Add column", command=self.ui_add_column)
+        add_btn.pack(side="left", padx=(0,6))
+
+        remove_btn = ttk.Button(top, text="Remove selected", command=self.ui_remove_selected)
+        remove_btn.pack(side="left", padx=(0,6))
+
+        help_btn = ttk.Button(top, text="Help / Guide", command=self.show_help)
+        help_btn.pack(side="right")
+
+        self.rows_var = tk.IntVar(value=100)
+        rows_spin = ttk.Spinbox(top, from_=1, to=1000000, textvariable=self.rows_var, width=8)
+        rows_spin.pack(side="left", padx=(0,6))
+
+        gen_btn = ttk.Button(top, text="Generate & Preview", command=self.generate_and_preview)
+        gen_btn.pack(side="left", padx=(12,6))
+
+        export_btn = ttk.Button(top, text="Export CSV", command=self.export_csv_dialog)
+        export_btn.pack(side="left", padx=(0,6))
+
+        ttk.Label(top, text="  ").pack(side="left", expand=True)  # spacer
+
+        # main area: headers + scrollable frame with list of columns
+        # 1) Fixed headers directly under the buttons
+        hdr = ttk.Frame(top_frame)
+        hdr.pack(fill="x", padx=8, pady=(0,6))
+        header_font = ('Arial', 10, 'bold italic')
+        ttk.Label(hdr, text="Name", width=20, font=header_font).grid(
+            row=0, column=0, sticky="w", padx=(10, 0)
+        )
+        ttk.Label(hdr, text="Type / Params", width=46, font=header_font).grid(
+            row=0, column=1, sticky="w", padx=(20, 0)
+        )
+        ttk.Label(hdr, text="Rounding", width=10, font=header_font).grid(
+            row=0, column=2, sticky="w", padx=(0, 0)
+        )
+        ttk.Label(hdr, text="Advanced", width=16, font=header_font).grid(
+            row=0, column=3, sticky="w", padx=(10, 0)
+        )
+
+        # 2) Scrollable container for rows (separate from headers)
+        scroll_container = ttk.Frame(top_frame)
+        scroll_container.pack(fill="both", expand=True, padx=8, pady=6)
+
+        # canvas + scrollbar
+        self.canvas = tk.Canvas(scroll_container)
+        self.canvas.pack(side="left", fill="both", expand=True)
+        scrollbar = ttk.Scrollbar(scroll_container, orient="vertical", command=self.canvas.yview)
+        scrollbar.pack(side="right", fill="y")
+        self.canvas.configure(yscrollcommand=scrollbar.set)
+
+        # adjust scrollregion when canvas resized
+        self.canvas.bind('<Configure>', lambda e: self.canvas.configure(scrollregion=self.canvas.bbox("all")))
+
+        self.inner_frame = ttk.Frame(self.canvas)
+        self.canvas.create_window((0,0), window=self.inner_frame, anchor='nw')
+
+        # list area
+        self.row_frames = {}
+        self.selected_col_id = None
+
+        self.refresh_column_list()
+
+        # Bottom frame: Preview table
+        bottom_frame = ttk.Frame(main_pane)
+        main_pane.add(bottom_frame, weight=1)
+
+        # Preview section
+        preview_label = ttk.Label(bottom_frame, text="Preview (First 10 rows):", font=('Arial', 10, 'bold italic'))
+        preview_label.pack(anchor='w', padx=8, pady=(8, 4))
+
+        # Create frame for table and scrollbar
+        table_container = ttk.Frame(bottom_frame)
+        table_container.pack(fill='both', expand=True, padx=8, pady=(0, 8))
+
+        # Create treeview for table display
+        self.preview_tree = ttk.Treeview(table_container, show='headings', height=10)
+        vsb = ttk.Scrollbar(table_container, orient="vertical", command=self.preview_tree.yview)
+        hsb = ttk.Scrollbar(table_container, orient="horizontal", command=self.preview_tree.xview)
+        self.preview_tree.configure(yscrollcommand=vsb.set, xscrollcommand=hsb.set)
+
+        # Pack the treeview and scrollbars
+        self.preview_tree.grid(row=0, column=0, sticky='nsew')
+        vsb.grid(row=0, column=1, sticky='ns')
+        hsb.grid(row=1, column=0, sticky='ew')
+        
+        table_container.grid_rowconfigure(0, weight=1)
+        table_container.grid_columnconfigure(0, weight=1)
+
+        # Bottom Labels
+        self.preview_status = ttk.Label(bottom_frame, text="No data generated yet. Click 'Generate & Preview' to see sample data.")
+        self.preview_status.pack(anchor='w', padx=8, pady=(0, 8))
+
+
+    # ---------- Column management ----------
+    def add_column(self, name="col"):
+        c = Column(name=name)
+        self.columns.append(c)
+        return c
+
+    def remove_column_by_id(self, cid):
+        self.columns = [c for c in self.columns if c.id != cid]
+
+    def find_column(self, cid):
+        for c in self.columns:
+            if c.id == cid:
+                return c
+        return None
+
+    # ---------- UI callbacks ----------
+    def ui_add_column(self):
+        n = 1
+        base = "col"
+        existing = {c.name for c in self.columns}
+        while f"{base}{n}" in existing:
+            n += 1
+        c = self.add_column(f"{base}{n}")
+        self.refresh_column_list()
+        # select new
+        self.selected_col_id = c.id
+
+    def ui_remove_selected(self):
+        if not self.selected_col_id:
+            messagebox.showinfo("Remove column", "Select a column row by clicking its name first.")
+            return
+        self.remove_column_by_id(self.selected_col_id)
+        self.selected_col_id = None
+        self.refresh_column_list()
+
+    def show_help(self):
+        """Show Help/Guide window"""
+        help_win = tk.Toplevel(self)
+        help_win.title("Help / Guide")
+        help_win.geometry("500x400")
+
+        # Instructions text
+        text = (
+            "Welcome to the Synthetic Data Generator!\n\n"
+            "➤ Use 'Add column' to create new data columns.\n"
+            "➤ Choose 'Random' or 'Fixed' values for each column.\n"
+            "➤ Adjust ranges, rounding, and advanced settings as needed.\n"
+            "➤ 'Generate & Preview' shows sample data (first 10 rows).\n"
+            "➤ 'Export CSV' saves the generated dataset to a CSV file.\n\n"
+            "Advanced:\n"
+            " - Use the 'Advanced' button per column to enable linearity, basically\n"
+            "   making one column follow another with a weighted influence.\n\n"
+        )
+        label = tk.Label(
+            help_win, 
+            text=text, 
+            justify="left", 
+            anchor="nw", 
+            font=("Arial", 10),
+            wraplength=460
+        )
+        label.pack(fill="both", expand=True, padx=12, pady=12)
+
+        cred = tk.Label(
+            help_win,
+            text=(
+                "This will be one of my scripts/executables.\n"
+                "Feel free to share!\n\n"
+                "You can leave feedback on my LinkedIn:\n"
+                "Sang Putu Sandhyana Yogi\n\n"
+                "Thank you so much!"
+            ),
+            font=("Arial", 7, "italic"),
+            justify="center"
+        )
+        cred.pack(fill="both", expand=True, padx=5, pady=5)
+
+        # Important notice
+        warning = tk.Label(
+            help_win, 
+            text="For Research / Training Purposes Only.\nDon't fake your Thesis Data!", 
+            font=("Arial", 10, "bold italic"), 
+            fg="red", 
+            justify="center"
+        )
+        warning.pack(pady=(0, 12))
+
+    def refresh_column_list(self):
+        # clear previous column rows (but keep the header which is now outside)
+        for child in list(self.inner_frame.pack_slaves()):
+            if child != self.inner_frame.pack_slaves()[0]:
+                child.destroy()
+        
+        # rebuild rows
+        for c in self.columns:
+            self._create_column_row(c)
+
+        # ensure scrollregion updates after refresh
+        self.inner_frame.update_idletasks()
+        self.canvas.configure(scrollregion=self.canvas.bbox("all"))
+
+    def _create_column_row(self, col: Column):
+        row = ttk.Frame(self.inner_frame, relief="ridge", padding=6)
+        row.pack(fill="x", pady=4)
+
+        # clicking name selects
+        name_var = tk.StringVar(value=col.name)
+        name_entry = ttk.Entry(row, textvariable=name_var, width=24)
+        name_entry.grid(row=0, column=0, sticky="w")
+        name_entry.bind("<FocusOut>", lambda e, cid=col.id, var=name_var: self._on_name_change(cid, var.get()))
+        name_entry.bind("<Button-1>", lambda e, cid=col.id: self._on_row_select(cid))
+
+        # Type + params frame
+        params = ttk.Frame(row)
+        params.grid(row=0, column=1, sticky="w", padx=(8,8))
+
+        type_var = tk.StringVar(value=col.type)
+        type_combo = ttk.Combobox(params, values=["Random", "Fixed"], width=8, state="readonly", textvariable=type_var)
+        type_combo.grid(row=0, column=0, padx=(0,6))
+        type_combo.bind("<<ComboboxSelected>>", lambda e, cid=col.id, var=type_var: self._on_type_change(cid, var.get()))
+        # Random: min/max entries; Fixed: fixed
+        min_var = tk.StringVar(value=str(col.min))
+        max_var = tk.StringVar(value=str(col.max))
+        fixed_var = tk.StringVar(value=str(col.fixed))
+
+        min_entry = ttk.Entry(params, textvariable=min_var, width=10)
+        min_entry.grid(row=0, column=1, padx=(0,4))
+        ttk.Label(params, text="to").grid(row=0, column=2)
+        max_entry = ttk.Entry(params, textvariable=max_var, width=10)
+        max_entry.grid(row=0, column=3, padx=(4,8))
+
+        fixed_entry = ttk.Entry(params, textvariable=fixed_var, width=12)
+        # place fixed entry but hide or show based on type
+        fixed_entry.grid(row=0, column=4, padx=(4,8))
+
+        # rounding
+        round_var = tk.IntVar(value=col.decimals)
+        round_combo = ttk.Combobox(row, values=[0,1,2,3,4,5,6], width=4, state="readonly", textvariable=round_var)
+        round_combo.grid(row=0, column=2)
+        round_combo.bind("<<ComboboxSelected>>", lambda e, cid=col.id, var=round_var: self._on_round_change(cid, int(var.get())))
+
+        # advanced button
+        adv_btn = ttk.Button(row, text="Advanced ▾", width=12)
+        adv_btn.grid(row=0, column=3, padx=(8,0))
+
+        # advanced area (hidden by default)
+        adv_frame = ttk.Frame(row)
+        adv_frame.grid(row=1, column=0, columnspan=4, pady=(8,0), sticky="w")
+        adv_frame.grid_remove()
+
+        # contents of advanced: linearity
+        lin_enabled_var = tk.BooleanVar(value=col.linearity["enabled"])
+        lin_check = ttk.Checkbutton(adv_frame, text="Enable Linearity (follow another column)", variable=lin_enabled_var)
+        lin_check.grid(row=0, column=0, sticky="w")
+        # target selector and weight
+        ttk.Label(adv_frame, text="Target:").grid(row=0, column=1, sticky="e", padx=(12,2))
+        target_values = [ (c.name, c.id) for c in self.columns if c.id != col.id ]
+        # if target list empty, provide placeholder
+        if not target_values:
+            target_combo = ttk.Combobox(adv_frame, values=["(no other columns)"], state="disabled", width=18)
+        else:
+            target_combo = ttk.Combobox(adv_frame, values=[tv[0] for tv in target_values], state="readonly", width=18)
+            # set current if exists
+            if col.linearity["target_id"]:
+                found = next((i for i,tv in enumerate(target_values) if tv[1]==col.linearity["target_id"]), None)
+                if found is not None:
+                    target_combo.current(found)
+        target_combo.grid(row=0, column=2, padx=(4,8))
+
+        ttk.Label(adv_frame, text="Weight:").grid(row=0, column=3, padx=(8,2))
+        weight_var = tk.DoubleVar(value=col.linearity["weight"])
+        weight_spin = ttk.Spinbox(adv_frame, from_=0.0, to=1.0, increment=0.01, textvariable=weight_var, width=6)
+        weight_spin.grid(row=0, column=4)
+        weight_scale = ttk.Scale(adv_frame, from_=0.0, to=1.0, orient="horizontal", variable=weight_var, length=120)
+        weight_scale.grid(row=0, column=5, padx=(8,0))
+
+        # after creating the row, update scrollregion so scrollbar appears
+        self.inner_frame.update_idletasks()
+        self.canvas.configure(scrollregion=self.canvas.bbox("all"))
+
+        # wire adv toggle button
+        def toggle_adv():
+            if adv_frame.winfo_ismapped():
+                adv_frame.grid_remove()
+                adv_btn.config(text="Advanced ▾")
+            else:
+                adv_frame.grid()
+                adv_btn.config(text="Advanced ▴")
+        adv_btn.config(command=toggle_adv)
+
+        # update widgets visibility according to type
+        def update_type_widgets():
+            t = type_var.get()
+            if t == "Random":
+                min_entry.configure(state="normal")
+                max_entry.configure(state="normal")
+                fixed_entry.configure(state="disabled")
+            else:
+                min_entry.configure(state="disabled")
+                max_entry.configure(state="disabled")
+                fixed_entry.configure(state="normal")
+
+        update_type_widgets()
+
+        # bind entry updates
+        def on_minmax_focus_out(e=None):
+            try:
+                col.min = float(min_var.get())
+                col.max = float(max_var.get())
+                if col.min > col.max:
+                    col.min, col.max = col.max, col.min
+                    min_var.set(str(col.min))
+                    max_var.set(str(col.max))
+            except Exception:
+                pass
+
+        def on_fixed_focus_out(e=None):
+            try:
+                col.fixed = float(fixed_var.get())
+            except Exception:
+                pass
+
+        min_entry.bind("<FocusOut>", on_minmax_focus_out)
+        max_entry.bind("<FocusOut>", on_minmax_focus_out)
+        fixed_entry.bind("<FocusOut>", on_fixed_focus_out)
+
+        # when combobox type changed
+        def on_type_selected(e=None):
+            col.type = type_var.get()
+            update_type_widgets()
+
+        type_combo.bind("<<ComboboxSelected>>", lambda e=None: on_type_selected())
+
+        # name change handler
+        # already bound above
+
+        # rounding handler bound above
+
+        # set initial values in widgets (in case)
+        min_var.set(str(col.min))
+        max_var.set(str(col.max))
+        fixed_var.set(str(col.fixed))
+
+        # clicking a row to 'select' it
+        def on_click_row(event=None):
+            self.selected_col_id = col.id
+            # highlight selection visually
+            for rf_cid, rf in self.row_frames.items():
+                if rf_cid == col.id:
+                    rf.config(style="Selected.TFrame")
+                else:
+                    rf.config(style="TFrame")
+
+        row.bind("<Button-1>", lambda e: on_click_row())
+        # also store refs for later updates
+        self.row_frames[col.id] = row
+
+        # store final update callbacks when user changes advanced widgets
+        def apply_all_changes():
+            col.name = name_var.get().strip() or col.name
+            col.type = type_var.get()
+            try:
+                col.min = float(min_var.get())
+            except Exception:
+                pass
+            try:
+                col.max = float(max_var.get())
+            except Exception:
+                pass
+            try:
+                col.fixed = float(fixed_var.get())
+            except Exception:
+                pass
+            col.decimals = int(round_var.get())
+            col.linearity["enabled"] = bool(lin_enabled_var.get())
+            col.linearity["weight"] = float(weight_var.get())
+            # determine target id by name in current dropdown
+            if isinstance(target_combo, ttk.Combobox) and target_combo['state'] != 'disabled':
+                sel_name = target_combo.get()
+                # find id by name
+                for other in self.columns:
+                    if other.id != col.id and other.name == sel_name:
+                        col.linearity["target_id"] = other.id
+                        break
+                else:
+                    # if no selection or not matched
+                    col.linearity["target_id"] = None
+
+        # call apply_all_changes when adv toggled or when leaving row
+        for w in [name_entry, min_entry, max_entry, fixed_entry, round_combo, lin_check, weight_spin, target_combo]:
+            w.bind("<FocusOut>", lambda e, f=apply_all_changes: f())
+
+        # when columns list changes (someone added/renamed) we need to refresh target lists.
+        # We'll rely on refresh_column_list to rebuild everything - keep simple.
+
+    # ---------- simple callbacks to update model ----------
+    def _on_name_change(self, cid, new_name):
+        c = self.find_column(cid)
+        if c:
+            c.name = new_name.strip() or c.name
+            # refresh to update target name lists
+            self.refresh_column_list()
+
+    def _on_type_change(self, cid, new_type):
+        c = self.find_column(cid)
+        if c:
+            c.type = new_type
+            self.refresh_column_list()
+
+    def _on_round_change(self, cid, dec):
+        c = self.find_column(cid)
+        if c:
+            c.decimals = dec
+
+    def _on_row_select(self, cid):
+        self.selected_col_id = cid
+        # visual selection handled in row click
+
+    # ---------- Generation logic ----------
+    def generate_rows(self, nrows):
+        # Validate and collect column metadata
+        if not self.columns:
+            raise RuntimeError("No columns defined")
+        # ensure all names unique
+        names = [c.name for c in self.columns]
+        if len(set(names)) != len(names):
+            # enforce uniqueness by appending small suffixes
+            seen = {}
+            for c in self.columns:
+                if c.name in seen:
+                    seen[c.name] += 1
+                    c.name = f"{c.name}_{seen[c.name]}"
+                else:
+                    seen[c.name] = 1
+
+        # Produce base values
+        base_values = { c.id: [] for c in self.columns }
+        for c in self.columns:
+            for _ in range(nrows):
+                if c.type == "Random":
+                    a = float(c.min)
+                    b = float(c.max)
+                    if a == b:
+                        val = a
+                    else:
+                        val = random.random() * (b - a) + a
+                else:
+                    val = float(c.fixed)
+                base_values[c.id].append(val)
+
+        # Now apply linearity adjustments
+        final_values = { c.id: [v for v in base_values[c.id]] for c in self.columns }
+
+        # We'll process adjustments in simple pass: for each column with linearity enabled,
+        # map target base value to source's min/max and mix with weight.
+        for c in self.columns:
+            lin = c.linearity
+            if lin["enabled"] and lin["target_id"]:
+                target = self.find_column(lin["target_id"])
+                if not target:
+                    continue
+                w = clamp(float(lin["weight"]), 0.0, 1.0)
+                smin = c.range_min()
+                smax = c.range_max()
+                tmin = target.range_min()
+                tmax = target.range_max()
+                # precompute denominators
+                t_range = tmax - tmin
+                s_range = smax - smin
+                for i in range(nrows):
+                    base_val = base_values[c.id][i]
+                    tval = base_values[target.id][i]
+                    # map tval into source's range:
+                    if t_range == 0:
+                        # target constant: use its value, scaled by midpoint mapping to source range
+                        mapped = smin + (s_range * 0.5) if s_range != 0 else smin
+                    else:
+                        frac = (tval - tmin) / t_range
+                        mapped = smin + frac * s_range
+                    new_val = (1.0 - w) * base_val + w * mapped
+                    final_values[c.id][i] = new_val
+
+        # apply rounding according to decimals
+        rows = []
+        for i in range(nrows):
+            row = {}
+            for c in self.columns:
+                dec = int(c.decimals)
+                val = final_values[c.id][i]
+                # apply rounding
+                if dec == 0:
+                    val = int(round(val))
+                else:
+                    val = round(val, dec)
+                row[c.name] = val
+            rows.append(row)
+        return rows
+
+    def generate_and_preview(self):
+        n_preview = 10
+        nrows = self.rows_var.get()
+        
+        if nrows < n_preview:
+            n_preview = nrows
+            
+        try:
+            data = self.generate_rows(n_preview)
+            self.update_preview_table(data)
+            self.preview_status.config(text=f"Preview showing first {n_preview} rows. Total rows to generate: {nrows}")
+        except Exception as e:
+            messagebox.showerror("Error generating", str(e))
+            self.preview_status.config(text="Error generating preview data")
+
+    def update_preview_table(self, data):
+        """Update the preview table with generated data"""
+        # Clear existing data
+        for item in self.preview_tree.get_children():
+            self.preview_tree.delete(item)
+            
+        # Clear existing columns
+        for col in self.preview_tree["columns"]:
+            self.preview_tree.heading(col, text="")
+            self.preview_tree.column(col, width=0)
+        
+        # Set up new columns
+        if not self.columns:
+            return
+            
+        columns = [c.name for c in self.columns]
+        self.preview_tree["columns"] = columns
+        
+        # Configure column headers
+        for col_name in columns:
+            self.preview_tree.heading(col_name, text=col_name)
+            self.preview_tree.column(col_name, width=100, minwidth=80, anchor='center')
+        
+        # Add data rows
+        for i, row in enumerate(data):
+            values = [row[col_name] for col_name in columns]
+            self.preview_tree.insert("", "end", values=values, tags=('evenrow' if i % 2 == 0 else 'oddrow',))
+        
+        # Configure row colors for better readability
+        self.preview_tree.tag_configure('evenrow', background='#f0f0f0')
+        self.preview_tree.tag_configure('oddrow', background='white')
+
+    # ---------- Export ----------
+    def export_csv_dialog(self):
+        nrows = self.rows_var.get()
+        if nrows <= 0:
+            messagebox.showinfo("Rows required", "Please specify a number of rows > 0.")
+            return
+        fname = filedialog.asksaveasfilename(title="Save CSV", defaultextension=".csv",
+                                            filetypes=[("CSV files","*.csv"),("All files","*.*")])
+        if not fname:
+            return
+        try:
+            data = self.generate_rows(nrows)
+            with open(fname, "w", newline="", encoding="utf-8") as f:
+                writer = csv.DictWriter(f, fieldnames=[c.name for c in self.columns])
+                writer.writeheader()
+                for row in data:
+                    writer.writerow(row)
+            messagebox.showinfo("Exported", f"Wrote {nrows} rows to:\n{fname}")
+        except Exception as e:
+            messagebox.showerror("Error", str(e))
+
+
+# ---------- Run the app ----------
+if __name__ == "__main__":
+    app = SyntheticDataGUI()
+    app.mainloop()

Scripts/Synthetic_Data_Generator/SDG_3.py

@@ -0,0 +1,691 @@
+#!/usr/bin/env python3
+import tkinter as tk
+from tkinter import ttk, messagebox, filedialog
+import uuid
+import random
+import csv
+import math
+import matplotlib.pyplot as plt
+import pandas as pd
+import numpy as np
+
+# ---------- Helper functions ----------
+def new_col_id():
+    return str(uuid.uuid4())
+
+def clamp(v, a, b):
+    return max(a, min(b, v))
+
+def format_decimals(dec):
+    return f"0.{''.join(['0']*dec)}" if dec>0 else "0"
+
+# ---------- Column model ----------
+class Column:
+    def __init__(self, name="col", col_id=None):
+        self.id = col_id or new_col_id()
+        self.name = name
+        self.type = "Random"   # or "Fixed"
+        self.min = 0.0
+        self.max = 10.0
+        self.fixed = 0.0
+        self.decimals = 0
+        self.linearity = {
+            "enabled": False,
+            "target_id": None,
+            "weight": 0.0
+        }
+
+    def range_min(self):
+        if self.type == "Random":
+            return float(self.min)
+        else:
+            return float(self.fixed)
+
+    def range_max(self):
+        if self.type == "Random":
+            return float(self.max)
+        else:
+            return float(self.fixed)
+
+# ---------- Main App ----------
+class SyntheticDataGUI(tk.Tk):
+    def __init__(self):
+        super().__init__()
+        self.title("Synthetic Data Generator v1.0")
+        self.geometry("920x800")
+        self.minsize(800, 600)
+
+        self.columns = []
+        self.generated_data = None   # <--- store last generated data
+        self.add_column("A")
+        self.add_column("B")
+
+        self._build_ui()
+
+    # ---------- UI building ----------
+    def _build_ui(self):
+        # Create main paned window for resizable sections
+        main_pane = ttk.PanedWindow(self, orient=tk.VERTICAL)
+        main_pane.pack(fill=tk.BOTH, expand=True, padx=8, pady=6)
+
+        # Top frame: controls and column definitions
+        top_frame = ttk.Frame(main_pane)
+        main_pane.add(top_frame, weight=1)
+
+        # top frame: controls
+        top = ttk.Frame(top_frame)
+        top.pack(side="top", fill="x", padx=8, pady=6)
+
+        add_btn = ttk.Button(top, text="Add column", command=self.ui_add_column)
+        add_btn.pack(side="left", padx=(0,6))
+
+        remove_btn = ttk.Button(top, text="Remove selected", command=self.ui_remove_selected)
+        remove_btn.pack(side="left", padx=(0,6))
+
+        help_btn = ttk.Button(top, text="Help / Guide", command=self.show_help)
+        help_btn.pack(side="right")
+
+        self.rows_var = tk.IntVar(value=100)
+        rows_spin = ttk.Spinbox(top, from_=1, to=1000000, textvariable=self.rows_var, width=8)
+        rows_spin.pack(side="left", padx=(0,6))
+
+        gen_btn = ttk.Button(top, text="Generate & Preview", command=self.generate_and_preview)
+        gen_btn.pack(side="left", padx=(12,6))
+
+        export_btn = ttk.Button(top, text="Export CSV", command=self.export_csv_dialog)
+        export_btn.pack(side="left", padx=(0,6))
+
+        vis_btn = ttk.Button(top, text="Visualize Data", command=self.visualize_data)
+        vis_btn.pack(side="left", padx=(12,6))
+
+        ttk.Label(top, text="  ").pack(side="left", expand=True)  # spacer
+
+        # main area: headers + scrollable frame with list of columns
+        # 1) Fixed headers directly under the buttons
+        hdr = ttk.Frame(top_frame)
+        hdr.pack(fill="x", padx=8, pady=(0,6))
+        header_font = ('Arial', 10, 'bold italic')
+        ttk.Label(hdr, text="Name", width=20, font=header_font).grid(
+            row=0, column=0, sticky="w", padx=(10, 0)
+        )
+        ttk.Label(hdr, text="Type / Params", width=46, font=header_font).grid(
+            row=0, column=1, sticky="w", padx=(20, 0)
+        )
+        ttk.Label(hdr, text="Rounding", width=10, font=header_font).grid(
+            row=0, column=2, sticky="w", padx=(0, 0)
+        )
+        ttk.Label(hdr, text="Advanced", width=16, font=header_font).grid(
+            row=0, column=3, sticky="w", padx=(10, 0)
+        )
+
+        # 2) Scrollable container for rows (separate from headers)
+        scroll_container = ttk.Frame(top_frame)
+        scroll_container.pack(fill="both", expand=True, padx=8, pady=6)
+
+        # canvas + scrollbar
+        self.canvas = tk.Canvas(scroll_container)
+        self.canvas.pack(side="left", fill="both", expand=True)
+        scrollbar = ttk.Scrollbar(scroll_container, orient="vertical", command=self.canvas.yview)
+        scrollbar.pack(side="right", fill="y")
+        self.canvas.configure(yscrollcommand=scrollbar.set)
+
+        # adjust scrollregion when canvas resized
+        self.canvas.bind('<Configure>', lambda e: self.canvas.configure(scrollregion=self.canvas.bbox("all")))
+
+        self.inner_frame = ttk.Frame(self.canvas)
+        self.canvas.create_window((0,0), window=self.inner_frame, anchor='nw')
+
+        # list area
+        self.row_frames = {}
+        self.selected_col_id = None
+
+        self.refresh_column_list()
+
+        # Bottom frame: Preview table
+        bottom_frame = ttk.Frame(main_pane)
+        main_pane.add(bottom_frame, weight=1)
+
+        # Preview section
+        preview_label = ttk.Label(bottom_frame, text="Preview (First 10 rows):", font=('Arial', 10, 'bold italic'))
+        preview_label.pack(anchor='w', padx=8, pady=(8, 4))
+
+        # Create frame for table and scrollbar
+        table_container = ttk.Frame(bottom_frame)
+        table_container.pack(fill='both', expand=True, padx=8, pady=(0, 8))
+
+        # Create treeview for table display
+        self.preview_tree = ttk.Treeview(table_container, show='headings', height=10)
+        vsb = ttk.Scrollbar(table_container, orient="vertical", command=self.preview_tree.yview)
+        hsb = ttk.Scrollbar(table_container, orient="horizontal", command=self.preview_tree.xview)
+        self.preview_tree.configure(yscrollcommand=vsb.set, xscrollcommand=hsb.set)
+
+        # Pack the treeview and scrollbars
+        self.preview_tree.grid(row=0, column=0, sticky='nsew')
+        vsb.grid(row=0, column=1, sticky='ns')
+        hsb.grid(row=1, column=0, sticky='ew')
+        
+        table_container.grid_rowconfigure(0, weight=1)
+        table_container.grid_columnconfigure(0, weight=1)
+
+        # Bottom Labels
+        self.preview_status = ttk.Label(bottom_frame, text="No data generated yet. Click 'Generate & Preview' to see sample data.")
+        self.preview_status.pack(anchor='w', padx=8, pady=(0, 8))
+
+
+    # ---------- Column management ----------
+    def add_column(self, name="col"):
+        c = Column(name=name)
+        self.columns.append(c)
+        return c
+
+    def remove_column_by_id(self, cid):
+        self.columns = [c for c in self.columns if c.id != cid]
+
+    def find_column(self, cid):
+        for c in self.columns:
+            if c.id == cid:
+                return c
+        return None
+
+    # ---------- UI callbacks ----------
+    def ui_add_column(self):
+        n = 1
+        base = "col"
+        existing = {c.name for c in self.columns}
+        while f"{base}{n}" in existing:
+            n += 1
+        c = self.add_column(f"{base}{n}")
+        self.refresh_column_list()
+        # select new
+        self.selected_col_id = c.id
+
+    def ui_remove_selected(self):
+        if not self.selected_col_id:
+            messagebox.showinfo("Remove column", "Select a column row by clicking its name first.")
+            return
+        self.remove_column_by_id(self.selected_col_id)
+        self.selected_col_id = None
+        self.refresh_column_list()
+
+    def show_help(self):
+        """Show Help/Guide window"""
+        help_win = tk.Toplevel(self)
+        help_win.title("Help / Guide")
+        help_win.geometry("500x400")
+
+        # Instructions text
+        text = (
+            "Welcome to the Synthetic Data Generator!\n\n"
+            "➤ Use 'Add column' to create new data columns.\n"
+            "➤ Choose 'Random' or 'Fixed' values for each column.\n"
+            "➤ Adjust ranges, rounding, and advanced settings as needed.\n"
+            "➤ 'Generate & Preview' shows sample data (first 10 rows).\n"
+            "➤ 'Export CSV' saves the generated dataset to a CSV file.\n\n"
+            "Advanced:\n"
+            " - Use the 'Advanced' button per column to enable linearity, basically\n"
+            "   making one column follow another with a weighted influence.\n\n"
+        )
+        label = tk.Label(
+            help_win, 
+            text=text, 
+            justify="left", 
+            anchor="nw", 
+            font=("Arial", 10),
+            wraplength=460
+        )
+        label.pack(fill="both", expand=True, padx=12, pady=12)
+
+        cred = tk.Label(
+            help_win,
+            text=(
+                "This will be one of my scripts/executables.\n"
+                "Feel free to share!\n\n"
+                "You can leave feedback on my LinkedIn:\n"
+                "Sang Putu Sandhyana Yogi\n\n"
+                "Thank you so much!"
+            ),
+            font=("Arial", 7, "italic"),
+            justify="center"
+        )
+        cred.pack(fill="both", expand=True, padx=5, pady=5)
+
+        # Important notice
+        warning = tk.Label(
+            help_win, 
+            text="For Research / Training Purposes Only.\nDon't fake your Thesis Data!", 
+            font=("Arial", 10, "bold italic"), 
+            fg="red", 
+            justify="center"
+        )
+        warning.pack(pady=(0, 12))
+
+    def refresh_column_list(self):
+        # clear all previous column rows
+        for child in list(self.inner_frame.pack_slaves()):
+            child.destroy()
+        
+        # rebuild rows
+        for c in self.columns:
+            self._create_column_row(c)
+
+        # ensure scrollregion updates
+        self.inner_frame.update_idletasks()
+        self.canvas.configure(scrollregion=self.canvas.bbox("all"))
+
+    def _create_column_row(self, col: Column):
+        row = ttk.Frame(self.inner_frame, relief="ridge", padding=6)
+        row.pack(fill="x", pady=4)
+
+        # clicking name selects
+        name_var = tk.StringVar(value=col.name)
+        name_entry = ttk.Entry(row, textvariable=name_var, width=24)
+        name_entry.grid(row=0, column=0, sticky="w")
+        name_entry.bind("<FocusOut>", lambda e, cid=col.id, var=name_var: self._on_name_change(cid, var.get()))
+        name_entry.bind("<Return>", lambda e, cid=col.id, var=name_var: self._on_name_change(cid, var.get()))
+        name_entry.bind("<Button-1>", lambda e, cid=col.id: self._on_row_select(cid))
+
+        # Type + params frame
+        params = ttk.Frame(row)
+        params.grid(row=0, column=1, sticky="w", padx=(8,8))
+
+        type_var = tk.StringVar(value=col.type)
+        type_combo = ttk.Combobox(params, values=["Random", "Fixed"], width=8, state="readonly", textvariable=type_var)
+        type_combo.grid(row=0, column=0, padx=(0,6))
+        type_combo.bind("<<ComboboxSelected>>", lambda e, cid=col.id, var=type_var: self._on_type_change(cid, var.get()))
+        # Random: min/max entries; Fixed: fixed
+        min_var = tk.StringVar(value=str(col.min))
+        max_var = tk.StringVar(value=str(col.max))
+        fixed_var = tk.StringVar(value=str(col.fixed))
+
+        min_entry = ttk.Entry(params, textvariable=min_var, width=10)
+        min_entry.grid(row=0, column=1, padx=(0,4))
+        ttk.Label(params, text="to").grid(row=0, column=2)
+        max_entry = ttk.Entry(params, textvariable=max_var, width=10)
+        max_entry.grid(row=0, column=3, padx=(4,8))
+
+        fixed_entry = ttk.Entry(params, textvariable=fixed_var, width=12)
+        # place fixed entry but hide or show based on type
+        fixed_entry.grid(row=0, column=4, padx=(4,8))
+
+        # rounding
+        round_var = tk.IntVar(value=col.decimals)
+        round_combo = ttk.Combobox(row, values=[0,1,2,3,4,5,6], width=4, state="readonly", textvariable=round_var)
+        round_combo.grid(row=0, column=2)
+        round_combo.bind("<<ComboboxSelected>>", lambda e, cid=col.id, var=round_var: self._on_round_change(cid, int(var.get())))
+
+        # advanced button
+        adv_btn = ttk.Button(row, text="Advanced ▾", width=12)
+        adv_btn.grid(row=0, column=3, padx=(8,0))
+
+        # advanced area (hidden by default)
+        adv_frame = ttk.Frame(row)
+        adv_frame.grid(row=1, column=0, columnspan=4, pady=(8,0), sticky="w")
+        adv_frame.grid_remove()
+
+        # contents of advanced: linearity
+        lin_enabled_var = tk.BooleanVar(value=col.linearity["enabled"])
+        lin_check = ttk.Checkbutton(adv_frame, text="Enable Linearity (follow another column)", variable=lin_enabled_var)
+        lin_check.grid(row=0, column=0, sticky="w")
+        # target selector and weight
+        ttk.Label(adv_frame, text="Target:").grid(row=0, column=1, sticky="e", padx=(12,2))
+        target_values = [ (c.name, c.id) for c in self.columns if c.id != col.id ]
+        # if target list empty, provide placeholder
+        if not target_values:
+            target_combo = ttk.Combobox(adv_frame, values=["(no other columns)"], state="disabled", width=18)
+        else:
+            target_combo = ttk.Combobox(adv_frame, values=[tv[0] for tv in target_values], state="readonly", width=18)
+            # set current if exists
+            if col.linearity["target_id"]:
+                found = next((i for i,tv in enumerate(target_values) if tv[1]==col.linearity["target_id"]), None)
+                if found is not None:
+                    target_combo.current(found)
+        target_combo.grid(row=0, column=2, padx=(4,8))
+
+        ttk.Label(adv_frame, text="Weight:").grid(row=0, column=3, padx=(8,2))
+        weight_var = tk.DoubleVar(value=col.linearity["weight"])
+        weight_spin = ttk.Spinbox(adv_frame, from_=0.0, to=1.0, increment=0.01, textvariable=weight_var, width=6)
+        weight_spin.grid(row=0, column=4)
+        weight_scale = ttk.Scale(adv_frame, from_=0.0, to=1.0, orient="horizontal", variable=weight_var, length=120)
+        weight_scale.grid(row=0, column=5, padx=(8,0))
+
+        # after creating the row, update scrollregion so scrollbar appears
+        self.inner_frame.update_idletasks()
+        self.canvas.configure(scrollregion=self.canvas.bbox("all"))
+
+        # wire adv toggle button
+        def toggle_adv():
+            if adv_frame.winfo_ismapped():
+                adv_frame.grid_remove()
+                adv_btn.config(text="Advanced ▾")
+            else:
+                adv_frame.grid()
+                adv_btn.config(text="Advanced ▴")
+        adv_btn.config(command=toggle_adv)
+
+        # update widgets visibility according to type
+        def update_type_widgets():
+            t = type_var.get()
+            if t == "Random":
+                min_entry.configure(state="normal")
+                max_entry.configure(state="normal")
+                fixed_entry.configure(state="disabled")
+            else:
+                min_entry.configure(state="disabled")
+                max_entry.configure(state="disabled")
+                fixed_entry.configure(state="normal")
+
+        update_type_widgets()
+
+        # bind entry updates
+        def on_minmax_focus_out(e=None):
+            try:
+                col.min = float(min_var.get())
+                col.max = float(max_var.get())
+                if col.min > col.max:
+                    col.min, col.max = col.max, col.min
+                    min_var.set(str(col.min))
+                    max_var.set(str(col.max))
+            except Exception:
+                pass
+
+        def on_fixed_focus_out(e=None):
+            try:
+                col.fixed = float(fixed_var.get())
+            except Exception:
+                pass
+
+        min_entry.bind("<FocusOut>", on_minmax_focus_out)
+        max_entry.bind("<FocusOut>", on_minmax_focus_out)
+        fixed_entry.bind("<FocusOut>", on_fixed_focus_out)
+
+        # when combobox type changed
+        def on_type_selected(e=None):
+            col.type = type_var.get()
+            update_type_widgets()
+
+        type_combo.bind("<<ComboboxSelected>>", lambda e=None: on_type_selected())
+
+        # name change handler
+        # already bound above
+
+        # rounding handler bound above
+
+        # set initial values in widgets (in case)
+        min_var.set(str(col.min))
+        max_var.set(str(col.max))
+        fixed_var.set(str(col.fixed))
+
+        # clicking a row to 'select' it
+        def on_click_row(event=None):
+            self.selected_col_id = col.id
+            # highlight selection visually
+            for rf_cid, rf in self.row_frames.items():
+                if rf_cid == col.id:
+                    rf.config(style="Selected.TFrame")
+                else:
+                    rf.config(style="TFrame")
+
+        row.bind("<Button-1>", lambda e: on_click_row())
+        # also store refs for later updates
+        self.row_frames[col.id] = row
+
+        # store final update callbacks when user changes advanced widgets
+        def apply_all_changes():
+            col.name = name_var.get().strip() or col.name
+            col.type = type_var.get()
+            try:
+                col.min = float(min_var.get())
+            except Exception:
+                pass
+            try:
+                col.max = float(max_var.get())
+            except Exception:
+                pass
+            try:
+                col.fixed = float(fixed_var.get())
+            except Exception:
+                pass
+            col.decimals = int(round_var.get())
+            col.linearity["enabled"] = bool(lin_enabled_var.get())
+            col.linearity["weight"] = float(weight_var.get())
+
+            # determine target id by name in current dropdown
+            if isinstance(target_combo, ttk.Combobox) and target_combo['state'] != 'disabled':
+                sel_name = target_combo.get()
+                # find id by matching current dropdown index instead of text
+                if target_combo.current() >= 0 and target_values:
+                    col.linearity["target_id"] = target_values[target_combo.current()][1]
+                else:
+                    col.linearity["target_id"] = None
+
+        # call apply_all_changes when adv toggled or when leaving row
+        for w in [name_entry, min_entry, max_entry, fixed_entry, round_combo, lin_check, weight_spin, target_combo]:
+            w.bind("<FocusOut>", lambda e, f=apply_all_changes: f())
+
+        # when columns list changes (someone added/renamed) we need to refresh target lists.
+        # We'll rely on refresh_column_list to rebuild everything - keep simple.
+
+    # ---------- simple callbacks to update model ----------
+    def _on_name_change(self, cid, new_name):
+        c = self.find_column(cid)
+        if c:
+            c.name = new_name.strip() or c.name
+            # refresh to update target name lists
+            self.refresh_column_list()
+
+    def _on_type_change(self, cid, new_type):
+        c = self.find_column(cid)
+        if c:
+            c.type = new_type
+            self.refresh_column_list()
+
+    def _on_round_change(self, cid, dec):
+        c = self.find_column(cid)
+        if c:
+            c.decimals = dec
+
+    def _on_row_select(self, cid):
+        self.selected_col_id = cid
+        # visual selection handled in row click
+
+    # ---------- Generation logic ----------
+    def generate_rows(self, nrows):
+        # Validate and collect column metadata
+        if not self.columns:
+            raise RuntimeError("No columns defined")
+        # ensure all names unique
+        names = [c.name for c in self.columns]
+        if len(set(names)) != len(names):
+            # enforce uniqueness by appending small suffixes
+            seen = {}
+            for c in self.columns:
+                if c.name in seen:
+                    seen[c.name] += 1
+                    c.name = f"{c.name}_{seen[c.name]}"
+                else:
+                    seen[c.name] = 1
+
+        # Produce base values
+        base_values = { c.id: [] for c in self.columns }
+        for c in self.columns:
+            for _ in range(nrows):
+                if c.type == "Random":
+                    a = float(c.min)
+                    b = float(c.max)
+                    if a == b:
+                        val = a
+                    else:
+                        val = random.random() * (b - a) + a
+                else:
+                    val = float(c.fixed)
+                base_values[c.id].append(val)
+
+        # Now apply linearity adjustments
+        final_values = { c.id: [v for v in base_values[c.id]] for c in self.columns }
+
+        # We'll process adjustments in simple pass: for each column with linearity enabled,
+        # map target base value to source's min/max and mix with weight.
+        for c in self.columns:
+            lin = c.linearity
+            if lin["enabled"] and lin["target_id"]:
+                target = self.find_column(lin["target_id"])
+                if not target:
+                    continue
+                w = clamp(float(lin["weight"]), 0.0, 1.0)
+                smin = c.range_min()
+                smax = c.range_max()
+                tmin = target.range_min()
+                tmax = target.range_max()
+                # precompute denominators
+                t_range = tmax - tmin
+                s_range = smax - smin
+                for i in range(nrows):
+                    base_val = base_values[c.id][i]
+                    tval = base_values[target.id][i]
+                    # map tval into source's range:
+                    if t_range == 0:
+                        # target constant: use its value, scaled by midpoint mapping to source range
+                        mapped = smin + (s_range * 0.5) if s_range != 0 else smin
+                    else:
+                        frac = (tval - tmin) / t_range
+                        mapped = smin + frac * s_range
+                    new_val = (1.0 - w) * base_val + w * mapped
+                    final_values[c.id][i] = new_val
+
+        # apply rounding according to decimals
+        rows = []
+        for i in range(nrows):
+            row = {}
+            for c in self.columns:
+                dec = int(c.decimals)
+                val = final_values[c.id][i]
+                # apply rounding
+                if dec == 0:
+                    val = int(round(val))
+                else:
+                    val = round(val, dec)
+                row[c.name] = val
+            rows.append(row)
+        return rows
+
+    def generate_and_preview(self):
+        n_preview = 10
+        nrows = self.rows_var.get()
+        
+        if nrows < n_preview:
+            n_preview = nrows
+            
+        try:
+            data = self.generate_rows(n_preview)
+            self.generated_data = self.generate_rows(nrows)  # store full data
+            self.update_preview_table(data)
+            self.preview_status.config(
+                text=f"Preview showing first {n_preview} rows. Total rows to generate: {nrows}"
+            )
+        except Exception as e:
+            messagebox.showerror("Error generating", str(e))
+            self.preview_status.config(text="Error generating preview data")
+
+    def update_preview_table(self, data):
+        """Update the preview table with generated data"""
+        # Clear existing data
+        for item in self.preview_tree.get_children():
+            self.preview_tree.delete(item)
+            
+        # Clear existing columns
+        for col in self.preview_tree["columns"]:
+            self.preview_tree.heading(col, text="")
+            self.preview_tree.column(col, width=0)
+        
+        # Set up new columns
+        if not self.columns:
+            return
+            
+        columns = [c.name for c in self.columns]
+        self.preview_tree["columns"] = columns
+        
+        # Configure column headers
+        for col_name in columns:
+            self.preview_tree.heading(col_name, text=col_name)
+            self.preview_tree.column(col_name, width=100, minwidth=80, anchor='center')
+        
+        # Add data rows
+        for i, row in enumerate(data):
+            values = [row[col_name] for col_name in columns]
+            self.preview_tree.insert("", "end", values=values, tags=('evenrow' if i % 2 == 0 else 'oddrow',))
+        
+        # Configure row colors for better readability
+        self.preview_tree.tag_configure('evenrow', background='#f0f0f0')
+        self.preview_tree.tag_configure('oddrow', background='white')
+
+    # ---------- Visualization ----------
+    def visualize_data(self):
+        if not self.generated_data:
+            messagebox.showinfo("Visualize Data", "Generate data first")
+            return
+
+        df = pd.DataFrame(self.generated_data)
+        nrows_total = len(df)
+        ncols = len(df.columns)
+        if ncols == 0:
+            messagebox.showinfo("Visualize Data", "No columns available")
+            return
+
+        # layout: up to 5 plots per row
+        max_cols = 5
+        nrows = (ncols + max_cols - 1) // max_cols
+        fig, axes = plt.subplots(nrows, min(ncols, max_cols), figsize=(4*max_cols, 3*nrows))
+
+        # normalize axes to flat list
+        if nrows == 1 and ncols == 1:
+            axes = [axes]
+        elif nrows == 1:
+            axes = axes
+        elif ncols <= max_cols:
+            axes = axes
+        axes = axes.flatten() if hasattr(axes, "flatten") else list(axes)
+
+        for i, col in enumerate(df.columns):
+            ax = axes[i]
+            if pd.api.types.is_numeric_dtype(df[col]):
+                df[col].plot(kind="hist", bins=20, ax=ax, title=col)
+            else:
+                df[col].value_counts().plot(kind="bar", ax=ax, title=col)
+
+        # hide unused axes
+        for j in range(i+1, len(axes)):
+            axes[j].set_visible(False)
+
+        # add top label showing dataset size
+        fig.suptitle(f"Visualizations based on {nrows_total} rows", fontsize=12, fontweight="bold")
+
+        plt.tight_layout(rect=[0, 0, 1, 0.96])  # leave space for title
+        plt.show()
+
+
+    # ---------- Export ----------
+    def export_csv_dialog(self):
+        nrows = self.rows_var.get()
+        if nrows <= 0:
+            messagebox.showinfo("Rows required", "Please specify a number of rows > 0.")
+            return
+        fname = filedialog.asksaveasfilename(title="Save CSV", defaultextension=".csv",
+                                            filetypes=[("CSV files","*.csv"),("All files","*.*")])
+        if not fname:
+            return
+        try:
+            data = self.generate_rows(nrows)
+            with open(fname, "w", newline="", encoding="utf-8") as f:
+                writer = csv.DictWriter(f, fieldnames=[c.name for c in self.columns])
+                writer.writeheader()
+                for row in data:
+                    writer.writerow(row)
+            messagebox.showinfo("Exported", f"Wrote {nrows} rows to:\n{fname}")
+        except Exception as e:
+            messagebox.showerror("Error", str(e))
+
+
+# ---------- Run the app ----------
+if __name__ == "__main__":
+    app = SyntheticDataGUI()
+    app.mainloop()