'pivot' property not recognised in quiver

[szymk]

When I try to set the 'pivot' kw argument to any value, the result is:

Traceback (most recent call last):
  File "plotInpTrajOut_LocBag.py", line 265, in <module>
    ax.quiver(x,y,z,u,v,w,length=0.2,color=colors[guid_nb],pivot='tail')
  File "/usr/lib/python2.7/dist-packages/mpl_toolkits/mplot3d/axes3d.py", line 2614, in quiver
    linec = art3d.Line3DCollection(lines, *args[argi:], **kwargs)
  File "/usr/lib/python2.7/dist-packages/mpl_toolkits/mplot3d/art3d.py", line 171, in __init__
    LineCollection.__init__(self, segments, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/matplotlib/collections.py", line 1060, in __init__
    **kwargs)
  File "/usr/lib/python2.7/dist-packages/matplotlib/collections.py", line 132, in __init__
    self.update(kwargs)
  File "/usr/lib/python2.7/dist-packages/matplotlib/artist.py", line 757, in update
    raise AttributeError('Unknown property %s' % k)
AttributeError: Unknown property pivot

I'm using matplotlib 1.4.2-3 under debian
BTW, it seems to me that the documentation on possible 'pivot' values is not consistent.

Hope it helps!

[tacaswell]

It looks like you are using the 3D version of quiver which I think only just got support for the pivot kwarg #3735. That code is on master, but won't be back-ported to the 1.4.x branch.

[szymk]

Yes, you're right, I was using quiver in 3D. I'll follow the development
and switch to the new code when available. Thanks for your answer!

Best regards,

Szymon

On 11 December 2014 at 18:53, Thomas A Caswell notifications@github.com
wrote:

It looks like you are using the 3D version of quiver which I think only
just got support for the pivot kwarg #3735
#3735. That code is on
master, but won't be back-ported to the 1.4.x branch.

—
Reply to this email directly or view it on GitHub
#3907 (comment)
.

Szymon Krupinski
szymk1@gmail.com

[efiring]

The documentation inconsistency you note is that "mid" is an alternative to "middle".

[tacaswell]

Not sure what we want to do about this, from looking at the code tip.* -> 'tip', 'mid.*' -> 'middle' and anything else results in tail.

ex

X, Y = np.meshgrid(np.linspace(-np.pi, np.pi, 16), np.linspace(-np.pi, np.pi, 16))
v = np.sin(X)
u = np.cos(Y)
plt.quiver(X, Y, u, v)
plt.quiver(X, Y, u, v, color='b', pivot='ardvaark', alpha=.5)

Results in no error and blue arrows overlaid on the black:

@efiring I am going to close this issue and make a new one for improving the validation on quiver.