[Numpy-discussion] stumped numpy user seeks help
Stefan van der Walt
stefan at sun.ac.za
Wed Aug 30 09:51:52 CDT 2006
On Tue, Aug 29, 2006 at 03:46:45PM -0700, Mathew Yeates wrote:
> My head is about to explode.
>
> I have an M by N array of floats. Associated with the columns are
> character labels
> ['a','b','b','c','d','e','e','e'] note: already sorted so duplicates
> are contiguous
>
> I want to replace the 2 'b' columns with the sum of the 2 columns.
> Similarly, replace the 3 'e' columns with the sum of the 3 'e' columns.
>
> The resulting array still has M rows but less than N columns. Anyone?
> Could be any harder than Sudoku.
I attach one possible solution (allowing for the same column name
occurring in different places, i.e. ['a','b','b','a']). I'd be glad
for any suggestions on how to clean up the code.
Regards
Stéfan
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