[Matplotlib-users] Postscript problem

[Carol L. <car...@sr...>]

I am trying to overlay a polar grid on a previously plotted axis.

The plot looks fine on the screen and in a png file.  However, I get an 
error message when making a postscript file.


Basically, I drew one set of axes in rectangular coordinates and then 
tried to overlay a polar grid with:
	# Save current axes
	ax = gca()
	l, b, w, h = ax.get_position()	# Normalized
	axp = axes([l, b, w, h], polar=True, frameon=False)
	theta = arange(0,1,0.001) * 2*2*pi
	r = array([1.0 for i in range(len(theta))])
	polar(theta, r, color='k')
	angles = arange(0,360,45)
	labels = ('','NE','','NW','','SW', '','SE' '')
	thetalines, thetatext = thetagrids(angles, labels)
	# Restore previous axes
	axes(ax)

I am using a version of the CVS code that I downloaded today, Nov. 30, 
2004.  I have source code I could send, but I doubt you want an 
attachment sent to the list.

Here are the messages that appear:
   File "testoverlay.py", line 90, in ?
     savefig('overlay.ps')
   File "/usr/lib/python2.3/site-packages/matplotlib/matlab.py", line 
1008, in savefig
     manager.canvas.print_figure(*args, **kwargs)
   File 
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_gtkagg.py", 
line 66, in print_figure
     agg.print_figure(filename, dpi, facecolor, edgecolor, orientation)
   File 
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_agg.py", 
line 385, in print_figure
     ps.print_figure(filename, dpi, facecolor, edgecolor, orientation)
   File 
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_ps.py", 
line 570, in print_figure
     self.figure.draw(renderer)
   File "/usr/lib/python2.3/site-packages/matplotlib/figure.py", line 
254, in draw
     for a in self.axes: a.draw(renderer)
   File "/usr/lib/python2.3/site-packages/matplotlib/axes.py", line 
3125, in draw
     l.draw(renderer)
   File "/usr/lib/python2.3/site-packages/matplotlib/lines.py", line 
257, in draw
     lineFunc(renderer, gc, xt, yt)
   File "/usr/lib/python2.3/site-packages/matplotlib/lines.py", line 
513, in _draw_dotted
     renderer.draw_lines(gc, xt, yt)
   File 
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_ps.py", 
line 275, in draw_lines
     self._draw_lines(gc,points[0:1000])
   File 
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_ps.py", 
line 264, in _draw_lines
     self._draw_ps("\n".join(ps), gc, None)
   File 
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_ps.py", 
line 375, in _draw_ps
     self.set_linedash(*gc.get_dashes())
   File 
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_ps.py", 
line 103, in set_linedash
     if seq:
   File "/usr/lib/python2.3/site-packages/numarray/generic.py", line 
477, in __nonzero__
     raise RuntimeError("An array doesn't make sense as a truth value. 
Use sometrue(a) or alltrue(a).")
RuntimeError: An array doesn't make sense as a truth value.  Use 
sometrue(a) or alltrue(a).


-- 
Ms. Carol A. Leger
SRI International			Phone: (650) 859-4114
333 Ravenswood Avenue G-273
Menlo Park, CA 94025                    e-mail: le...@sr...