widget_gaussian

(You can also check this code in the repository)

import sys

import numpy as np
from scipy.stats import norm
from matplotlib import pyplot as plt
from matplotlib.figure import Figure
from matplotlib.backends.backend_qt5agg import FigureCanvas
from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT
from PySide6.QtCore import Qt, Slot
from PySide6.QtWidgets import (
    QApplication,
    QWidget,
    QDoubleSpinBox,
    QVBoxLayout,
    QHBoxLayout,
)


"""This example implements the interaction between Qt Widgets and a 2D
matplotlib plot showing a gaussian curve with scipy"""


class PlotWidget(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        #  create widgets
        self.view = FigureCanvas(Figure(figsize=(5, 3)))
        self.axes = self.view.figure.subplots()
        self.toolbar = NavigationToolbar2QT(self.view, self)
        self.mu_input = QDoubleSpinBox()
        self.std_input = QDoubleSpinBox()
        self.mu_input.setPrefix("μ: ")
        self.std_input.setPrefix("σ: ")
        self.std_input.setValue(10)

        #  Create layout
        input_layout = QHBoxLayout()
        input_layout.addWidget(self.mu_input)
        input_layout.addWidget(self.std_input)
        vlayout = QVBoxLayout()
        vlayout.addWidget(self.toolbar)
        vlayout.addWidget(self.view)
        vlayout.addLayout(input_layout)
        self.setLayout(vlayout)

        # connect inputs with on_change method
        self.mu_input.valueChanged.connect(self.on_change)
        self.std_input.valueChanged.connect(self.on_change)

        self.on_change()

    @Slot()
    def on_change(self):
        """ Update the plot with the current input values """
        mu = self.mu_input.value()
        std = self.std_input.value()

        x = np.linspace(-100, 100)
        y = norm.pdf(x, mu, std)

        self.axes.clear()
        self.axes.plot(x, y)
        self.view.draw()


if __name__ == "__main__":

    app = QApplication(sys.argv)
    w = PlotWidget()
    w.show()
    sys.exit(app.exec())