matplotlib-users Mailing List for matplotlib

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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On Sun, Sep 26, 2010 at 3:49 AM, sa6113 <s.p...@gm...> wrote:

>
> I want to use more than 2 axes in my plot, for example yleft,yright, butoom
> or top, is it possible?
> any body had done it before?
>
> I read in matplotlib's document that : " matplotlib is organized around
> figures and axes. The figure contains an arbitrary number of axes, which
> can
> be placed anywhere in the figure you want, including over other axes. You
> can directly create and manage your own figures and axes."
> How?
> --


I suggest spending sometime going through the matplotlib gallery. [
http://matplotlib.sourceforge.net/gallery.html]

This example should give you a good start for multiple axes plotting
[
http://matplotlib.sourceforge.net/examples/axes_grid/demo_parasite_axes2.html
]


Gökhan

I want to use more than 2 axes in my plot, for example yleft,yright, butoom
or top, is it possible?
any body had done it before?

I read in matplotlib's document that : " matplotlib is organized around
figures and axes. The figure contains an arbitrary number of axes, which can
be placed anywhere in the figure you want, including over other axes. You
can directly create and manage your own figures and axes."
How?
-- 
View this message in context: http://old.nabble.com/axes-in-matplotlib-tp29810432p29810432.html
Sent from the matplotlib - users mailing list archive at Nabble.com.

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