绘制轴线或Matplotlib等高线图的原点 [英] Draw axis lines or the origin for Matplotlib contour plot

问题描述

我想在我的轮廓图中使用白色绘制 x = 0 和 y = 0 轴。如果那太麻烦了，我想用一个白点表示原点在哪里。

I want to draw x=0 and y=0 axis in my contour plot, using a white color. If that is too cumbersome, I would like to have a white dot denoting where the origin is.

我的轮廓图如下所示，创建代码如下。

My contour plot looks as follows and the code to create it is given below.

xvec = linspace(-5.,5.,100)                               
X,Y = meshgrid(xvec, xvec)                                
fig = plt.figure(figsize=(6, 4))                      
contourf(X, Y, W,100)                             
plt.colorbar()                                    

推荐答案

有很多选项（例如居中的棘齿 ），但就您而言，使用 轴线 和 axvline 。

There are a number of options (E.g. centered spines), but in your case, it's probably simplest to just use axhline and axvline.

例如

import numpy as np
import matplotlib.pyplot as plt

xvec = np.linspace(-5.,5.,100)                               
x,y = np.meshgrid(xvec, xvec)
z = -np.hypot(x, y)                                

plt.contourf(x, y, z, 100)                             
plt.colorbar() 

plt.axhline(0, color='white')
plt.axvline(0, color='white')

plt.show()

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