Hi all, I didn't get any answers to this email. Is it because the proposed addition to numpy is not of any interest to anybody apart from me ? Maybe the way I introduced this is wrong. Please tell me what is wrong with this proposition. Regards, Gaël On Fri, Oct 20, 2006 at 01:28:52PM +0200, Gael Varoquaux wrote:
Hi,
There is an operation I do a lot, I would call it "unrolling" a array. The best way to describe it is probably to give the code:
def unroll(M): """ Flattens the array M and returns a 2D array with the first columns being the indices of M, and the last column the flatten M. """ return hstack((indices(M.shape).reshape(-1,M.ndim),M.reshape(-1,1)))
Example:
M array([[ 0.73530097, 0.3553424 , 0.3719772 ], [ 0.83353373, 0.74622133, 0.14748905], [ 0.72023762, 0.32306969, 0.19142366]])
unroll(M) array([[ 0. , 0. , 0.73530097], [ 0. , 1. , 0.3553424 ], [ 1. , 1. , 0.3719772 ], [ 2. , 2. , 0.83353373], [ 2. , 0. , 0.74622133], [ 1. , 2. , 0.14748905], [ 0. , 1. , 0.72023762], [ 2. , 0. , 0.32306969], [ 1. , 2. , 0.19142366]])
The docstring sucks. The function is trivial (when you know numpy a bit). Maybe this function already exists in numpy, if so I couldn't find it. Elsewhere I propose it for inclusion.
Cheers,
Gaël
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