[Numpy-discussion] Syntax trouble in translating matlab code to numpy

Robert Kern robert.kern@gmail....
Thu Apr 12 14:09:12 CDT 2007


Oliver Siemoneit wrote:

>     # Transform to LMS space
>     LMS = numpy.zeros_like(RGB)
>     for i in range(RGB.shape[0]):
>         for j in range(RGB.shape[1]):
>             rgb = RGB[i,j,:2]
>             LMS[i,j,:2] = numpy.dot(rgb2lms, rgb)
> 
> This code fails in the last line with the error message "ValueError: 
> matrices are not aligned". But how to align them?

You want :3, not :2.

By the way, I have some code that applies a more rigorous model for
colorblindness. The class LinearCorrespondingPairs in this file:

http://www.enthought.com/~rkern/cgi-bin/hgwebdir.cgi/colormap_explorer/file/9955ae141feb/colormap_explorer/vision_model.py

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
  -- Umberto Eco


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