[Matplotlib-users] strange error in points_to_pixel

[Arnold M. <arn...@wu...>]

Hi all,

I encountered a strange error (which I now remember was there already in 
version 0.50). When I run (for example) the mathtext_demo.py, I get the 
following error:

<error>
File 
"/usr/lib/python2.3/site-packages/matplotlib/backends/backend_gtk.py", 
line 504, in points_to_pixels
     return points*PIXELS_PER_INCH/72.0*self.dpi.get()/72.0
TypeError: unsupported operand type(s) for /: 'array' and 'float'
</error>

When I replace that line 504 with (note the parentheses)
     return points*(PIXELS_PER_INCH/72.0*self.dpi.get()/72.0)
python is happy.

I don't understand why python doesn't like the present construct.
Possibly an odd combination of versions:

-> Python 2.3 (#2, Aug 31 2003, 17:27:29) [GCC 3.3.1 (Mandrake Linux 9.2 
3.3.1-1mdk)] on linux2
-> Numeric 22.0
-> scipy cvs_version = (1,196,1591,4120)

Cheers,

Arnold

PS: the mathtext-option was a very pleasant surprise to me (hadn't seen 
any discussion on it on the mailing list).