Python中的 Matplotlib.axes.Axes.get_xbound()

Matplotlib是Python中的一个库，它是 NumPy 库的数值数学扩展。 Axes 类包含大部分图形元素：Axis、Tick、Line2D、Text、Polygon 等，并设置坐标系。 Axes 的实例通过回调属性支持回调。

matplotlib.axes.Axes.get_xbound()函数

matplotlib 库的axes 模块中的Axes.get_xbound()函数用于按递增顺序返回x 轴的上下数值范围

Syntax: Axes.get_xbound(self)

Parameters: This method does not accepts any parameters.

Returns:This method returns the following

lower, upper :This returns the current lower and upper x-axis bounds.

编程需要懂一点英语

注意：此函数可以在各种情况下代替 get_xlim 使用。

下面的示例说明了 matplotlib.axes 中的 matplotlib.axes.Axes.get_xbound()函数：

示例 1：

# Implementation of matplotlib function
from matplotlib.widgets import Cursor
import numpy as np
import matplotlib.pyplot as plt
    
fig, [ax, ax1] = plt.subplots(2, 1)
t = 4*(np.random.rand(2, 100) - .5)
x = np.cos(2 * np.pi * t)
y = np.sin(2 * np.pi * t)
   
ax.plot(x, y, 'g')
lower, upper = ax.get_xbound()
ax.set_title('matplotlib.axes.Axes.get_xbound()\
 Example\n Original Window',
             fontsize = 14, fontweight ='bold')
   
ax1.plot(x, y, 'g')
ax1.set_xbound(1.5 * lower, 0.5 * upper)
ax1.set_title('Window After Using get_xbound() function',
             fontsize = 14, fontweight ='bold')
plt.show()

输出：

示例 2：

import numpy as np
import matplotlib.pyplot as plt
   
# Fixing random state for
# reproducibility
np.random.seed(19680801)
   
# the random data
x = np.random.randn(1000)
y = np.random.randn(1000)
   
# definitions for the axes
left, width = 0.1, 0.65
bottom, height = 0.1, 0.65
spacing = 0.005
   
   
rect_scatter = [left, bottom,
                width, height]
  
rect_histx = [left,
              bottom + height + spacing,
              width, 0.2]
  
rect_histy = [left + width + spacing,
              bottom, 0.2, height]
   
# start with a rectangular Figure
plt.figure()
   
ax_scatter = plt.axes(rect_scatter)
ax_scatter.tick_params(direction ='in',
                       bottom = True, 
                       right = True)
  
ax_histx = plt.axes(rect_histx)
ax_histx.tick_params(direction ='in',
                     labeltop = True)
  
ax_histy = plt.axes(rect_histy)
ax_histy.tick_params(direction ='in',
                     labelleft = True)
  
   
# the scatter plot:
ax_scatter.scatter(2 * x, y * 2, color ="green")
   
# now determine nice limits by hand:
binwidth = 0.05
lim = np.ceil(np.abs([x, y]).max() / binwidth) * binwidth
ax_scatter.set_xbound((-0.5 * lim, 0.5 * lim))
ax_scatter.set_ybound((-0.25 * lim, 0.25 * lim))
   
bins = np.arange(-lim, lim + binwidth, binwidth)
ax_histx.hist(x, bins = bins,
              color ="green")
ax_histy.hist(y, bins = bins, 
              color ="green", 
              orientation ='horizontal')
   
ax_histx.set_xbound(ax_scatter.get_xbound())
ax_histy.set_ybound(ax_scatter.get_ybound())
   
plt.show()

输出：