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Matplotlib.axes.Axes.spy() in Python

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  • Last Updated : 13 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.spy() Function

The Axes.spy() function in axes module of matplotlib library is also used to plot the sparsity pattern of a 2D array.It is also used to visualize the non-zero values of the array.

Syntax: Axes.spy(self, Z, precision=0, marker=None, markersize=None, aspect=’equal’, origin=’upper’, **kwargs

Parameters: This method accept the following parameters that are described below:

  • Z : This parameter is the array which is to be plotted.
  • precision : This parameter is used to determine whether any non-zero value is to be plotted or not.
  • origin : This parameter place the [0, 0] index of the array in the upper left or lower left corner of the axes.
  • aspect : This parameter is an optional and it is used to control the aspect ratio of the axes.

Returns: This returns the following:

  • ret:This returns the AxesImage or Line2D. And it depend on style of plotting

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


# Implementation of matplotlib function
import matplotlib.pyplot as plt
import numpy as np
fig, ax1 = plt.subplots()
x = np.random.randn(20, 50)
x[12, :] = 0.
x[:, 22] = 0.
ax1.set_title('matplotlib.axes.Axes.spy() Example')



# Implementation of matplotlib function
import matplotlib.pyplot as plt
import numpy as np
fig, [(ax1, ax2), (ax3, ax4)] = plt.subplots(2, 2)
x = np.random.randn(20, 50)
x[5, :] = 0.
x[:, 12] = 0.
ax1.spy(x, markersize = 4)
ax2.spy(x, precision = 0.2, markersize = 4)
ax4.spy(x, precision = 0.4)
ax1.set_title('matplotlib.axes.Axes.spy() Example')


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