A way to compute a 2d histogram

David Huard david.huard at gmail.com
Tue Oct 24 12:02:26 CDT 2006


Hi Xavier,

You could tweak histogram2d to do what you want, or you could give me a
couple of days and I'll do it and let you know. If you want to help, you
could write a test using your particular application and data.

David











2006/10/24, Xavier Gnata <gnata at obs.univ-lyon1.fr>:
>
> 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.
>
>
> --
> ############################################
> Xavier Gnata
> CRAL - Observatoire de Lyon
> 9, avenue Charles André
> 69561 Saint Genis Laval cedex
> Phone: +33 4 78 86 85 28
> Fax: +33 4 78 86 83 86
> E-mail: gnata at obs.univ-lyon1.fr
> ############################################
>
>
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