特定数量的网格点的matplotlib流图错误

问题描述

以下最小代码段在n=29时失败，但在n=28或n=30 。

import numpy
import matplotlib.pyplot as plt
x = np.linspace(0,1,n)
plt.streamplot(x,x,np.meshgrid(x,x)[0],np.meshgrid(x,x)[1])
plt.show()

当n=29时给出的误差为

---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
~/.local/lib/python3.6/site-packages/matplotlib/streamplot.py in _integrate_rk12(x0, y0, dmap, f, maxlength)
    526         try:
--> 527             k1x, k1y = f(xi, yi)
    528             k2x, k2y = f(xi + ds * k1x,

~/.local/lib/python3.6/site-packages/matplotlib/streamplot.py in backward_time(xi, yi)
    434     def backward_time(xi, yi):
--> 435         dxi, dyi = forward_time(xi, yi)
    436         return -dxi, -dyi

~/.local/lib/python3.6/site-packages/matplotlib/streamplot.py in forward_time(xi, yi)
    425     def forward_time(xi, yi):
--> 426         ds_dt = interpgrid(speed, xi, yi)
    427         if ds_dt == 0:

~/.local/lib/python3.6/site-packages/matplotlib/streamplot.py in interpgrid(a, xi, yi)
    619     a00 = a[y, x]
--> 620     a01 = a[y, xn]
    621     a10 = a[yn, x]

~/.local/lib/python3.6/site-packages/numpy/ma/core.py in __getitem__(self, indx)
   3196         # So it's easier to stick to the current version
-> 3197         dout = self.data[indx]
   3198         _mask = self._mask

IndexError: index 29 is out of bounds for axis 1 with size 29

这使我发疯了一段时间。 当n = 28或n = 30时生成图。 我什至在google collab上检查了代码，以确保没有以某种方式弄乱我的库。

知道为什么会这样吗？