# Matplotlib.axes.Axes.set_ybound() in Python

• Last Updated : 19 Apr, 2020

Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. The Axes Class contains most of the figure elements: Axis, Tick, Line2D, Text, Polygon, etc., and sets the coordinate system. And the instances of Axes supports callbacks through a callbacks attribute.

## matplotlib.axes.Axes.set_ybound() Function

The Axes.set_ybound() function in axes module of matplotlib library is used to set the lower and upper numerical bounds of the y-axis.

Syntax: Axes.set_ybound(self, lower=None, upper=None)

Parameters: This method accepts the following parameters.

• lower, upper: These parameters are the lower and upper bounds. If None, the respective axis bound is not modified.

Returns:This method returns the following

• lower, upper :This returns the new lower and upper y-axis bounds.

Note: This function can be used in place of set_ylim in various conditions.

Below examples illustrate the matplotlib.axes.Axes.set_ybound() function in matplotlib.axes:

Example 1:

 `# Implementation of matplotlib function``from` `matplotlib.widgets ``import` `Cursor``import` `numpy as np``import` `matplotlib.pyplot as plt``  ` `  ` `np.random.seed(``19680801``)``  ` `fig, ax ``=` `plt.subplots()``  ` `x, y ``=` `4``*``(np.random.rand(``2``, ``50``) ``-` `.``5``)``ax.plot(x, y, ``'g'``)``ax.set_ybound(``-``4``, ``4``)``      ` `ax.set_title(``'matplotlib.axes.Axes.set_ybound() Example\n'``,``             ``fontsize ``=` `14``, fontweight ``=``'bold'``)``plt.show()`

Output:

Example 2:

 `# Implementation of matplotlib function``import` `matplotlib.pyplot as plt``import` `numpy as np``  ` `fig1, ax1 ``=` `plt.subplots()``fig2, ax2 ``=` `plt.subplots()``ax1.``set``(xlim ``=``(``-``0.5``, ``1.5``), ylim ``=``(``-``0.5``, ``1.5``), ``        ``autoscale_on ``=` `False``)`` ` `ax2.``set``(xlim ``=``(``0.5``, ``0.75``), ylim ``=``(``0.5``, ``0.75``),``        ``autoscale_on ``=` `False``)``  ` `x, y, s, c ``=` `np.random.rand(``4``, ``200``)``s ``*``=` `200``  ` `ax1.scatter(x, y, s, c)``ax2.scatter(x, y, s, c)``  ` `  ` `def` `GFG(event):`` ` `    ``if` `event.button !``=` `1``:``        ``return`` ` `    ``x, y ``=` `event.xdata, event.ydata``    ``ax2.set_xbound(x ``-` `0.1``, x ``+` `0.1``)``    ``ax2.set_ybound(y ``-` `0.2``, y ``+` `0.2``)``    ``fig2.canvas.draw()``  ` `fig1.canvas.mpl_connect(``'button_press_event'``, GFG)   ``ax1.set_title('matplotlib.axes.Axes.set_ybound()\`` ``Example\n Original Window ',``             ``fontsize ``=` `14``, fontweight ``=``'bold'``)`` ` `ax2.set_title(``'Zoomed window '``,``             ``fontsize ``=` `14``, fontweight ``=``'bold'``)``plt.show()`

Output:

My Personal Notes arrow_drop_up