[EMAIL PROTECTED] wrote:
> Eric Firing wrote:
>>>> Well, the easiest way is to build mpl from svn; a few minutes ago I
>>>> added this capability to quiver, selectable with an "angles" kwarg.
>
> Eric,
>
> I tried just copying the quiver.py SVN version 6114 into my existing
> matplotlib install and numpy 1.1.1. When running my example posted
> earlier with the angles='xy' keyword added to the quiver call, I get the
> following error:
Fixed in svn 6115. Sorry I didn't catch it initially. It was a pretty
basic bug.
Eric
>
> In [10]: show()
> ---------------------------------------------------------------------------
> <type 'exceptions.ValueError'> Traceback (most recent call last)
>
> /usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py in
> expose_event(self, widget, event)
> 331 x, y, w, h = self.allocation
> 332 self._pixmap_prepare (w, h)
> --> 333 self._render_figure(self._pixmap, w, h)
> 334 self._need_redraw = False
> 335
>
> /usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtkagg.py
> in _render_figure(self, pixmap, width, height)
> 73 def _render_figure(self, pixmap, width, height):
> 74 if DEBUG: print 'FigureCanvasGTKAgg.render_figure'
> ---> 75 FigureCanvasAgg.draw(self)
> 76 if DEBUG: print 'FigureCanvasGTKAgg.render_figure
> pixmap', pixmap
> 77 #agg_to_gtk_drawable(pixmap, self.renderer._renderer, None)
>
> /usr/lib/python2.5/site-packages/matplotlib/backends/backend_agg.py in
> draw(self)
> 259
> 260 self.renderer = self.get_renderer()
> --> 261 self.figure.draw(self.renderer)
> 262
> 263 def get_renderer(self):
>
> /usr/lib/python2.5/site-packages/matplotlib/figure.py in draw(self,
> renderer)
> 757
> 758 # render the axes
> --> 759 for a in self.axes: a.draw(renderer)
> 760
> 761 # render the figure text
>
> /usr/lib/python2.5/site-packages/matplotlib/axes.py in draw(self,
> renderer, inframe)
> 1521
> 1522 for zorder, i, a in dsu:
> -> 1523 a.draw(renderer)
> 1524
> 1525 renderer.close_group('axes')
>
> /usr/lib/python2.5/site-packages/matplotlib/quiver.py in draw(self,
> renderer)
> 423 self._init()
> 424 if self._new_UV or self.angles == 'xy':
> --> 425 verts = self._make_verts(self.U, self.V)
> 426 self.set_verts(verts, closed=False)
> 427 self._new_UV = False
>
> /usr/lib/python2.5/site-packages/matplotlib/quiver.py in
> _make_verts(self, U, V)
> 483 else:
> 484 theta = ma.asarray(self.angles*np.pi/180.0).filled(0)
> --> 485 xy = (X+Y*1j) * np.exp(1j*theta)*self.width
> 486 xy = xy[:,:,np.newaxis]
> 487 XY = ma.concatenate((xy.real, xy.imag), axis=2)
>
> /usr/lib/python2.5/site-packages/numpy/ma/core.py in __mul__(self, other)
> 1710 def __mul__(self, other):
> 1711 "Multiply other by self, and return a new masked array."
> -> 1712 return multiply(self, other)
> 1713 #
> 1714 def __div__(self, other):
>
> /usr/lib/python2.5/site-packages/numpy/ma/core.py in __call__(self, a,
> b, *args, **kwargs)
> 513 m = mask_or(getmask(a), getmask(b))
> 514 (d1, d2) = (get_data(a), get_data(b))
> --> 515 result = self.f(d1, d2, *args,
> **kwargs).view(get_masked_subclass(a, b))
> 516 if result.size > 1:
> 517 if m is not nomask:
>
> <type 'exceptions.ValueError'>: shape mismatch: objects cannot be
> broadcast to a single shape
>
>
>
> Do you know if this is caused by trying to use the new quiver.py in
> 0.98.3? Does my example before (copied below for convenience) work for
> you?
>
> from pylab import *
>
> X,Y = meshgrid( arange(0,1,.2),arange(0,1,.2) )
> def yprime(x,y):
> return 1
>
> U,V = meshgrid([1]*len(X), [1]*len(Y))
>
> figure()
> Q = quiver(X,Y,U, V, angles='xy')
>
> # This is a solution to the differential equation y'=1, but it doesn't
> # look like it because the slopes do not respect the aspect ratio of
> # the plot. What should happen is the arrows should point along the
> # line.
> plot([0,1],[0,1])
>
> axis([0,1,0,0.5])
>
> title("Slope Field for $dy/dx=1$")
> show()
>
>
> Thanks,
>
> Jason
>
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