matshow函数

"""Simple matshow() example."""import matplotlib.pyplot as pltimport numpy as npdef samplemat(dims):    """Make a matrix with all zeros and increasing elements on the diagonal"""    aa = np.zeros(dims)    for i in range(min(dims)):        aa[i, i] = i    return aa# Display 2 matrices of different sizesdimlist = [(12, 12), (15, 35)]for d in dimlist:    plt.matshow(samplemat(d))# Display a random matrix with a specified figure number and a grayscale# colormapplt.matshow(np.random.rand(64, 64), fignum=100, cmap=plt.cm.gray)plt.show()