Re: [Matplotlib-users] Problem with vlines ... and tcl !!!

[John H. <jdh...@ac...>]

>>>>> "Philippe" == Philippe Bouige <pb...@pa...> writes:

    Philippe> Hello,

    Philippe>     I try 'vline_demo' in directory 'example' and I have
    Philippe> problem with vlines ... error : "rank-O array has no
    Philippe> length". I try also with hlines and I have the same
    Philippe> problem ...

    Philippe>     I also this error with all the demo : error reading
    Philippe> package index file C:/Python23/tcl/tix8.1/pkgIndex.tcl:
    Philippe> invalid command name "lt}]}"

    Philippe>     Have you a explanation ?

This turns out to be numarray specific - most of my tests use Numeric
which is why I didn't catch that.  I'll try and make sure I do a
numarray specific test in the future.  Todd, perhaps you should also
make a note to run backend_driver on your numarray build, at least for
Agg.  That wouldn't have helped this time, because vline_demo.py was
not in the regression suite, but I've added it.

Now on to your problem.  This is caused by a difference in how Numeric
and numarray treak rank 0 arrays

    >>> from Numeric import asarray
    >>> len(asarray(0))
    1
    >>> from numarray import asarray
    >>> len(asarray(0))
    Traceback (most recent call last):
      File "<stdin>", line 1, in ?
    ValueError: Rank-0 array has no length.

I don't know why there is this difference but I'm sure Todd or Perry
can comment at length :-).

To solve your vline problem, you need to make the vmin and vmax args
of vlines (or hlines) iterable.  Ie

old

  vlines(t, 0, s, color='k')

new

  vlines(t, [0], s, color='k')
  
Should work!  Thanks for letting us know.

John Hunter