[Matplotlib-users] trouble with Arrow

[Alan G I. <ai...@am...>]

I just want to draw a few vectors of different colors.
In Mathematica I would use Arrow:
http://reference.wolfram.com/mathematica/ref/Arrow.html

In Matplotlib I cannot find an easy way.  Here's the best
I came up with so far.

import matplotlib.pyplot as plt
from matplotlib.patches import Arrow
fig, ax = plt.subplots(1,1)
ax.set_aspect('equal')
ax.add_artist( Arrow(0,0,1,1, width=0.1, facecolor='red',edgecolor=None) )
ax.add_artist( Arrow(0,1,1,-1, width=0.01, facecolor='k',edgecolor=None) )

Things that seem wrong with the interface:
- takes 4 numbers instead of a list of points
- head length and width is not determined by the line width
- edge drawing cannot (?) be turned off

The head drawing issue is particularly serious.

So, have I overlooked an easy way to do what I want?

One other question: am I supposed to use `add_patch` or
`add_artist`, and why?

Thanks,
Alan Isaac