Python中的 Matplotlib.pyplot.axhspan()

Matplotlib是Python中的一个库，它是 NumPy 库的数值数学扩展。 Pyplot是Matplotlib模块的基于状态的接口，它提供了一个类似 MATLAB 的接口。

matplotlib.pyplot.axhspan()函数

matplotlib 库的 pyplot 模块中的axhspan()函数用于在轴上添加水平跨度（矩形）。

Syntax: matplotlib.pyplot.axhspan(ymin, ymax, xmin=0, xmax=1, **kwargs)

Parameters: This method accept the following parameters that are described below:

• ymin: This parameter is the lower limit of the horizontal span in data units.
• ymax: This parameter is the upper limit of the horizontal span in data units.
• xmin: This parameter is the lower limit of the vertical span in data units.
• xmax: This parameter is the upper limit of the vertical span in data units.

Returns: This returns the Polygon.

下面的示例说明了 matplotlib.pyplot 中的 matplotlib.pyplot.axhspan()函数：

示例 1：

import matplotlib.pyplot as plt
  
  
# xmin = 0 and xmax = 1 is the
# default value
plt.axhspan(0.25, 0.75, facecolor ='r', alpha = 0.7)

输出：

示例 2：

#Implementation of matplotlib function
import numpy as np 
import matplotlib.pyplot as plt 
    
t = np.arange(-2, 3, .01) 
s = np.sin(np.pi * t) 
    
plt.plot(t, s, color ='black') 
plt.axhline(y = 1, color ='black') 
  
plt.axvline(x = 1, color ='black') 
plt.axvline(x = 0.5, ymin = 0.75, linewidth = 8,
            color ='green') 
  
plt.axhline(y =.5, xmin = 0.25, xmax = 0.75,
            color ='black') 
    
plt.axhspan(0.25, 0.75, facecolor ='0.5', alpha = 0.5) 
plt.axvspan(2.25, 2.55, facecolor ='green', alpha = 0.5) 
  
plt.title('matplotlib.pyplot.axhspan() Example\n',
          fontsize=14, fontweight='bold')
  
plt.show()

输出：