On Wed, Sep 15, 2010 at 7:27 AM, Oz Nahum <nahu...@gmail.com> wrote:
> Hi Everyone,
>
> I'm trying to make a quiver plot using the example in examples collection.
> The documentation says that I can define the arrow units as:
>
> units: [‘width’ | ‘height’ | ‘dots’ | ‘inches’ | ‘x’ | ‘y’ | ‘xy’]so I did:
> from pylab import *
> from numpy import ma
>
> X,Y = meshgrid( arange(0,2*pi,.2),arange(0,2*pi,.2) )
> U = cos(X)
> V = sin(Y)
>
>
> figure()
> M = sqrt(pow(U, 2) + pow(V, 2))
> Q = quiver( X, Y, U, V, M, units='x', pivot='tip', width=0.022,
> scale=1/0.15)
>
> Q = quiver( X, Y, U, V, M, units='xy', pivot='tip', width=0.022,
> scale=1/0.15)
>
> qk = quiverkey(Q, 0.9, 1.05, 1, r'$1 \frac{m}{s}$',
> labelpos='E',
> fontproperties={'weight': 'bold'})
> plot(X, Y, 'k.')
> axis([-1, 7, -1, 7])
> title("scales with x view; pivot='tip'")
> show()
>
>
> When I actually try the option 'xy' I get the following error:
>
> Exception in Tkinter callback
> Traceback (most recent call last):
> File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1413, in __call__
> return self.func(*args)
> File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_tkagg.py",
> line 212, in resize
> self.show()
> File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_tkagg.py",
> line 215, in draw
> FigureCanvasAgg.draw(self)
> File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_agg.py",
> line 314, in draw
> self.figure.draw(self.renderer)
> File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "/usr/lib/pymodules/python2.6/matplotlib/figure.py", line 773, in
> draw
> for a in self.axes: a.draw(renderer)
> File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "/usr/lib/pymodules/python2.6/matplotlib/axes.py", line 1735, in draw
> a.draw(renderer)
> File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "/usr/lib/pymodules/python2.6/matplotlib/quiver.py", line 436, in
> draw
> self._init()
> File "/usr/lib/pymodules/python2.6/matplotlib/quiver.py", line 425, in
> _init
> trans = self._set_transform()
> File "/usr/lib/pymodules/python2.6/matplotlib/quiver.py", line 481, in
> _set_transform
> raise ValueError('unrecognized units')
> ValueError: unrecognized units
>
> Can someone point to where am I mistaken ? Is it a mistake in the
> documentation ?
Your code works fine for me here on 1.0.0. What version are you running?
Ryan
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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