matplotlib.pyplot.matshow 矩阵可视化实例
作者：Hero_Never_GIVE_UP
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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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