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I don't know if it could help, but with matplotlib 0.71, the version 
I've installed, the error doesn't occur.
HTH,
 Andrea.
On 3 Mar 2005, at 16:14, Arnold Moene wrote:
> Dear all,
>
> The following simple script gives an error on matplotlib-0.72.1:
> # Start script
> from pylab import *
> from Numeric import *
>
> x=arange(0.1,10,0.1)
> y=sin(x)
>
> grid()
> plot(x,y)
> savefig('foo.eps')
> # end script

Dear all,
The following simple script gives an error on matplotlib-0.72.1:
# Start script
from pylab import *
from Numeric import *
x=arange(0.1,10,0.1)
y=sin(x)
grid()
plot(x,y)
savefig('foo.eps')
# end script
The error disappears when I remove the grid() switch.
The error message is:
 File "foo.py", line 10, in ?
 savefig('foo.eps')
 File "/usr/lib/python2.3/site-packages/matplotlib/pylab.py", line 763,
in savefig
 try: ret = fig.savefig(*args, **kwargs)
 File "/usr/lib/python2.3/site-packages/matplotlib/figure.py", line
455, in savefig
 self.canvas.print_figure(*args, **kwargs)
 File
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_ps.py",
line 646, in print_figure
 self.figure.draw(renderer)
 File "/usr/lib/python2.3/site-packages/matplotlib/figure.py", line
338, in draw
 for a in self.axes: a.draw(renderer)
 File "/usr/lib/python2.3/site-packages/matplotlib/axes.py", line 1281,
in draw
 self.xaxis.draw(renderer)
 File "/usr/lib/python2.3/site-packages/matplotlib/axis.py", line 523,
in draw
 tick.draw(renderer)
 File "/usr/lib/python2.3/site-packages/matplotlib/axis.py", line 135,
in draw
 if midPoint and self.gridOn: self.gridline.draw(renderer)
 File "/usr/lib/python2.3/site-packages/matplotlib/lines.py", line 283,
in draw
 lineFunc(renderer, gc, xt, yt)
 File "/usr/lib/python2.3/site-packages/matplotlib/lines.py", line 569,
in _draw_dotted
 renderer.draw_lines(gc, xt, yt)
 File
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_ps.py",
line 355, in draw_lines
 self._draw_lines(gc,to_draw)
 File
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_ps.py",
line 338, in _draw_lines
 self._draw_ps("\n".join(ps), gc, None)
 File
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_ps.py",
line 453, in _draw_ps
 self.set_linewidth(gc.get_linewidth())
 File
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_ps.py",
line 114, in set_linewidth
 self._pswriter.write("%1.3f setlinewidth\n"%linewidth)
TypeError: float argument required
The error disappears (or at least is no longer visible) when I replace 
line 113 in backend_ps.py by:
self._pswriter.write("%1.3f setlinewidth\n"%float(linewidth))
I hope someone can make a thorough fix. At the moment I can live with my 
workaround.
Cheers, Arnold
-- 
------------------------------------------------------------------------
Arnold F. Moene NEW tel: +31 (0)317 482604
Meteorology and Air Quality Group fax: +31 (0)317 482811
Wageningen University e-mail: Arnold.Moene at wur.nl
Duivendaal 2 url: http://www.met.wau.nl
6701 AP Wageningen
The Netherlands
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