A way to compute a 2d histogram

Xavier Gnata gnata at obs.univ-lyon1.fr
Tue Oct 24 11:31:33 CDT 2006


Hi,

I have a set of 3 1D large arrays.
The first 2 one stand for the coordinates of particules and the last one 
for their masses.
I would like to be able to plot this data ie to compute a 2D histogram 
summing the masses in each bin.
I cannot find a way to do that without any loop on the indices resulting 
too a very slow function.

I'm looking for an elegant way to do that with numpy (or scipy??) function.

For instance, scipy.histogram2d cannot do the job because it only counts 
the number of samples in each bin.
There is no way to deal with weights.

Xavier.
 

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Xavier Gnata
CRAL - Observatoire de Lyon
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Fax: +33 4 78 86 83 86
E-mail: gnata at obs.univ-lyon1.fr
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