[Matplotlib-users] Postscript problem

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

> Yep, this is a bug.  In backend_ps in the the set_linedashes function
> on line 103, replace the line
> 
>     if seq: 
> 
> with 
> 
>     if seq is not None and len(seq):
> 
> My guess is you are using numarray, and if memory serves numarray but
> not Numeric fails on using an array as a boolean, which is what
> backend ps is doing here.
> 
>
Yes, I am using numarray.  I made the change to line 103 and now line 
102 is reporting a similar error.

Traceback (most recent call last):
   File "testoverlay.py", line 91, 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 102, in set_linedash
     if (offset,seq) != self.linedash:
   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...