The function arrow() works for me (Python 2.6.5, matplotlib 99.1.2).
Perhaps something in your installation needs to be changed.
You might try pylab.Arrow() to create patches or perhaps quiver() which
draws a whole set of arrows.
On 09/26/2010 08:11 AM, Gus Ishere wrote:
I'd like to plot some arrows. I can use the pyplot.arrow function but
it does not give an arrow head. I am trying to use FancyArrow in the
following way:
import matplotlib as mpl
import matplotlib.pyplot as plt
plt.figure(None)
ax = plt.gca()
arr = mpl.patches.FancyArrowPatch((0,0),(3,2),arrowstyle='simple')
ax.add_patch(arr)
plt.show()
but I get "ValueError: Given lines do not intersect" in the bezier.py
file. (Full traceback below)
Thanks for any hints!
Gus
Traceback (most recent call last):
File "M:\mypy\minimum.py", line 8, in <module>
ax.add_patch(arr)
File "C:\Python26\lib\site-packages\matplotlib\axes.py", line 1453,
in add_patch
self._update_patch_limits(p)
File "C:\Python26\lib\site-packages\matplotlib\axes.py", line 1469,
in _update_patch_limits
vertices = patch.get_path().vertices
File "C:\Python26\lib\site-packages\matplotlib\patches.py", line
3792, in get_path
_path, fillable = self.get_path_in_displaycoord()
File "C:\Python26\lib\site-packages\matplotlib\patches.py", line
3822, in get_path_in_displaycoord
self.get_mutation_aspect()
File "C:\Python26\lib\site-packages\matplotlib\patches.py", line
2845, in __call__
return self.transmute(path, mutation_size, linewidth)
File "C:\Python26\lib\site-packages\matplotlib\patches.py", line
3384, in transmute
tail_left, tail_right = get_parallels(arrow_out, tail_width/2.)
File "C:\Python26\lib\site-packages\matplotlib\bezier.py", line 359,
in get_parallels
c2x_left, c2y_left, cos_t2, sin_t2)
File "C:\Python26\lib\site-packages\matplotlib\bezier.py", line 34,
in get_intersection
raise ValueError("Given lines do not intersect")
ValueError: Given lines do not intersect
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