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Python Matplotlib.pyplot.gray()用法及代码示例


Matplotlib是Python中的一个库,它是数字的-NumPy库的数学扩展。 Pyplot是Matplotlib模块的基于状态的接口,该模块提供了MATLAB-like接口。

Matplotlib.pyplot.gray()函数

matplotlib库的pyplot模块中的gray()函数用于将颜色映射设置为“gray”。

用法:



matplotlib.pyplot.gray()

以下示例说明了matplotlib.pyplot中的matplotlib.pyplot.gray()函数:

范例1:

# Implementation of matplotlib function 
import matplotlib.pyplot as plt 
import matplotlib.tri as tri 
import numpy as np  
      
ang = 40
rad = 10
radm = 0.35
radii = np.linspace(radm, 0.95, rad) 
      
angles = np.linspace(0, 3 * np.pi, ang) 
angles = np.repeat(angles[..., np.newaxis],  
                   rad, axis = 1) 
angles[:, 1::2] += np.pi / ang 
      
x = (radii * np.cos(angles)).flatten() 
y = (radii * np.sin(angles)).flatten() 
z = (np.sin(4 * radii) * np.cos(4 * angles)).flatten() 
      
triang = tri.Triangulation(x, y) 
triang.set_mask(np.hypot(x[triang.triangles].mean(axis = 1), 
                         y[triang.triangles].mean(axis = 1)) 
                < radm) 
      
tpc = plt.tripcolor(triang, z, shading ='flat') 
  
plt.colorbar(tpc) 
plt.gray() 
plt.title('matplotlib.pyplot.gray() function\ 
Example\n\n', fontweight ="bold") 
  
plt.show()

输出:

范例2:

# Implementation of matplotlib function 
import matplotlib.pyplot as plt 
import numpy as np 
from matplotlib.colors import LogNorm 
         
      
dx, dy = 0.015, 0.05
x = np.arange(-4.0, 4.0, dx) 
y = np.arange(-4.0, 4.0, dy) 
X, Y = np.meshgrid(x, y) 
      
extent = np.min(x), np.max(x), np.min(y), np.max(y) 
     
Z1 = np.add.outer(range(8), range(8)) % 2
  
plt.imshow(Z1, cmap ="binary_r",  
           interpolation ='nearest', 
           extent = extent, alpha = 1) 
      
def geeks(x, y):
      
    return (1 - x / 2 + x**5 + y**6) * np.exp(-(x**2 + y**2)) 
      
Z2 = geeks(X, Y) 
      
plt.imshow(Z2, alpha = 0.7,  
           interpolation ='bilinear', 
           extent = extent) 
plt.gray() 
plt.title('matplotlib.pyplot.gray() function Example\n\n', 
          fontweight ="bold") 
  
plt.show()

输出:




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注:本文由纯净天空筛选整理自SHUBHAMSINGH10大神的英文原创作品 Matplotlib.pyplot.gray() in Python。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。