The following was sent unintentionally in private e-mail (my e-mail
program always selects the sender as recipient first :-( ). I think
the solution by Jae-Joon is also elegant, but nevertheless the
following may be useful also (and maybe also in other places):
---------- Forwarded message ----------
From: Friedrich Romstedt <friedrichromst...@gmail.com>
Date: 2010/2/24
Subject: Re: [Matplotlib-users] Looping through all the built-in colormaps
To: David Goldsmith <d_l_goldsm...@yahoo.com>
> 0) is there some "elegant" way to do what I want to do?
Don't know whether it's elegant or not, but it should do the job:
for cmap_name in dir(cm):
cmap_object = getattr(cm, cmap_name)
if isinstance(cmap_object, matplotlib.colors.LinearSegmentedColormap):
[...]
> 1) why doesn't this:
>
>>>> for cmap in dir(cm):
>>>> try:
>>>> ax.imshow(image, cmap)
>>>> canvas.print_figure('image_'+cmap)
>>>> except:
>>>> pass
>
> "work" (i.e., simply bypass those elements of dir(cm) which cause imshow to
> raise an exception, but then continue on as if nothing had happened)? Is
> this a bug?
I guess it's because you have messed up with the internals of the
axes, when passing an invalid entry. It gets stored somewhere without
check, and then causes subsequent error occuring before the next
element is applied fully, I guess. It's more a bug of your code than
of matplotlib, because your argument did not fulfil specification :-)
Friedrich
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