python matlibplot绘制矩阵_matplotlib.pyplot.matshow 矩阵可视化实例
這是一個繪制矩陣的函數(shù)。
用matshow繪制矩陣的例子:
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()
效果圖:
補(bǔ)充知識:利用matplotlib將矩陣畫成三維圖
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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