matplotlib.pyplot.matshow矩阵可视化 matplotlib.pyplot.matshow 矩阵可视化实例
Hero_Never_GIVE_UP 人气:0这是一个绘制矩阵的函数。
用matshow绘制矩阵的例子:
import matplotlib.pyplot as plt import numpy as np def 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 matrix plt.matshow(samplemat((15, 15))) plt.show()
效果图:
补充知识:利用matplotlib将矩阵画成三维图
import cv2 as cv import numpy as np import matplotlib.pyplot as plt from matplotlib import cm from mpl_toolkits import mplot3d cap = cv.VideoCapture(0) cpframe = None while True: ret, frame = cap.read() cv.imshow("video", frame) if cv.waitKey(1) & 0xFF ==ord('q'): cpframe = frame break img_gray = cv.cvtColor(cpframe, cv.COLOR_RGB2GRAY) Y = np.arange(0, np.shape(img_gray)[0], 1) X = np.arange(0, np.shape(img_gray)[1], 1) X, Y = np.meshgrid(X, Y) fig = plt.figure() ax = plt.axes(projection="3d") ax.plot_surface(X, Y, img_gray, cmap=cm.gist_rainbow) plt.show()
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