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matplotlib.pyplot.matshow 矩阵可视化实例

作者:Hero_Never_GIVE_UP  发布时间:2022-01-04 02:57:21 

标签:matplotlib,pyplot,matshow,矩阵,可视化

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:

matplotlib.pyplot.matshow 矩阵可视化实例

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()

matplotlib.pyplot.matshow 矩阵可视化实例

来源:https://blog.csdn.net/Hero_Never_GIVE_UP/article/details/82895103

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