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Getting Stared with Matplotlib - Subplots in Matplotlib

At times, we might want to display more than one chart at a time. We can achieve this by using subplots.

INSTRUCTIONS
  • First, import Pyplot

    import matplotlib.<< your code goes here >> as plt
    
  • Now we will create a sample plot

    plt.plot([1,4,7])
    

    We did this to demonstrate that creating a subplot will delete any pre-existing subplot that overlaps with it beyond sharing a boundary.

  • Now, in the same cell as before, we will create a subplot using the subplot() function with top plot of a grid with 2 rows and 1 column. Since this subplot will overlap the first, the plot (and its axes) previously created, will be removed

    plt.<< your code goes here >>(2,1,1)
    plt.plot(range(12))
    plt.subplot(2,1,2, facecolor='red')
    plt.plot(range(12))
    plt.show()
    

    The third line creates a second subplot with red background.

  • You can add an insert plot in the same figure by adding another axes object in the same figure canvas. The matplotlib.figure module contains the Figure class. It is a top-level container for all plot elements. The Figure object is instantiated by calling the figure() function of the pyplot module. You can create it as follows:

    import matplotlib.pyplot as plt
    import numpy as np
    import math
    x = np.arange(0, math.pi*2, 0.09)
    fig=plt.figure()
    axes1 = fig.add_axes([0.1, 0.1, 0.9, 0.9])
    axes2 = fig.add_axes([0.62, 0.62, 0.3, 0.3])
    y = np.sin(x)
    axes1.plot(x, y, 'b')
    axes2.plot(x,np.cos(x),'r')
    axes1.set_title('sine')
    axes2.set_title("cosine")
    plt.show()
    

    Here, axes1 is the main axes, and axes2 is the inset axes. You can test with different values to move and resize the charts.


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