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# Modifying the coordinate formatter

Show how to modify the coordinate formatter to report the image “z” value of the nearest pixel given x and y

    import numpy as np
    import matplotlib.pyplot as plt

    # Fixing random state for reproducibility
    np.random.seed(19680801)

    X = 10*np.random.rand(5, 3)

    fig, ax = plt.subplots()
    ax.imshow(X, interpolation='nearest')

    numrows, numcols = X.shape

    def format_coord(x, y):
        col = int(x + 0.5)
        row = int(y + 0.5)
        if col >= 0 and col < numcols and row >= 0 and row < numrows:
            z = X[row, col]
            return 'x=%1.4f, y=%1.4f, z=%1.4f' % (x, y, z)
        else:
            return 'x=%1.4f, y=%1.4f' % (x, y)

    ax.format_coord = format_coord
    plt.show()

Total running time of the script: ( 0 minutes 0.033 seconds)

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