Python中的 Matplotlib.axes.Axes.quiver()

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.quiver()函数

matplotlib 库的 axes 模块中的Axes.barbs()函数也用于绘制 2D 箭头字段。

Syntax: Axes.quiver(self, *args, data=None, **kw

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

X, Y : These parameter are the x and y coordinates of the arrow locations.
U, V: These parameter are the x and y components of the arrow vector.
C : This parameter contains the numeric data that defines the arrow colors by colormapping via norm and cmap.
pivot : This parameter is the part of the arrow that is anchored to the X, Y grid.
units : This parameter is the arrow dimensions (except for length) are measured in multiples of this unit.
angles : This parameter is the method for determining the angle of the arrows.
scale : This parameter is the number of data units per arrow length unit.
scale_units : This parameter is an optional parameter nad it contains these values ‘width’, ‘height’, ‘dots’, ‘inches’, ‘x’, ‘y’, ‘xy’ .
width : This parameter is the shaft width in arrow units.
headwidth : This parameter is the head width as multiple of shaft width.
headlength : This parameter is the length width as multiple of shaft width.
headwidth : This parameter is the head width as multiple of shaft width.
headaxislength : This parameter is the head length at shaft intersection.
minshaft : This parameter is the length below which arrow scales, in units of head length.
minlength : This parameter is the minimum length as a multiple of shaft width.
color : This parameter is the explicit color(s) for the arrows.

编程需要懂一点英语

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

示例 1：

# Implementation of matplotlib function
import matplotlib.pyplot as plt
import numpy as np
      
X = np.arange(-20, 20, 0.5)
Y = np.arange(-20, 20, 0.5)
U, V = np.meshgrid(X, Y)
  
fig, ax = plt.subplots()
q = ax.quiver(X, Y, U, V)
  
ax.set_title('matplotlib.axes.Axes.quiver()\
 Example', fontsize = 14, fontweight ='bold')
plt.show()

输出：

示例 2：

# Implementation of matplotlib function
import matplotlib.pyplot as plt
import numpy as np
      
X, Y = np.meshgrid(np.arange(0, 2 * np.pi, .2), 
                   np.arange(0, 2 * np.pi, .2))
U = np.cos(X**2)
V = np.sin(Y**2)
C = U**2 + V**2
  
fig, ax = plt.subplots()
ax.quiver(X, Y, U, V, C, units ='width')
ax.set_title('matplotlib.axes.Axes.quiver() \
Example', fontsize = 14, fontweight ='bold')
plt.show()

输出：