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# Scatter Masked

    import matplotlib.pyplot as plt
    import numpy as np

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

    N = 100
    r0 = 0.6
    x = 0.9 * np.random.rand(N)
    y = 0.9 * np.random.rand(N)
    area = np.pi * (10 * np.random.rand(N))**2  # 0 to 10 point radii
    c = np.sqrt(area)
    r = np.sqrt(x * x + y * y)
    area1 = np.ma.masked_where(r < r0, area)
    area2 = np.ma.masked_where(r >= r0, area)
    plt.scatter(x, y, s=area1, marker='^', c=c)
    plt.scatter(x, y, s=area2, marker='o', c=c)
    # Show the boundary between the regions:
    theta = np.arange(0, np.pi / 2, 0.01)
    plt.plot(r0 * np.cos(theta), r0 * np.sin(theta))

    plt.show()

Total running time of the script: ( 0 minutes 0.039 seconds)

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