Thanks, I read some of your previous posts dealing with the pcolor and tried
this route but didn't succeed yet...
I really agree with you on the interest of having an option to pass an array
rather than value for the alpha keyword !
________________________________
De : Benjamin Root <ben.r...@ou.edu>
À : Auré Gourrier <aurelien.gourr...@yahoo.fr>
Cc : matplotlib-users@lists.sourceforge.net
Envoyé le : Jeu 10 mars 2011, 18h 43min 31s
Objet : Re: [Matplotlib-users] alternative to imshow with polar axes ?
On Thu, Mar 10, 2011 at 8:40 AM, Auré Gourrier <aurelien.gourr...@yahoo.fr>
wrote:
Dear all,
>
>Once again, I turn for help.
>I'm trying to plot a polar image using colormap values for the theta values
>and
>increasing alpha values along the radius.
>I do this using imshow passing the rgba tuple at each pixel position which
>works
>very nicely with rectangular axes, but fails to display using polar axes (see
>code below).
>
>As usual, I've done a fair bit of digging to find where the problem is and
>whether I could make out an alternate solution but haven't managed to come
>through. I've tried using pcolormesh but I don't see how to pass the rgba tuple
>Can anyone point me in the right direction.
>I'm using matplotlib 1.0.1 and Python 2.4
>
>Cheers,
>
>Auré
>
>
It appears that imshow() (and matshow()) do not support non-rectilinear axes.
I
don't know if this is a bug or if there is no way to make it support polar
projections. Hopefully, someone else more knowledgable could chime in on this.
I am also not exactly sure how to accomplish what you want using pcolor. A
really slow, painful way would be to pcolor each row with the rest masked out,
setting the alpha value for that row. I have long wondered if the alpha kwarg
in various functions could be improved by allowing array values and take
advantage of numpy broadcasting.
Ben Root
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