A way to compute a 2d histogram

David Huard david.huard at gmail.com
Wed Oct 25 08:13:43 CDT 2006


Nicolas, thanks for the bug report, I fooled around with argument passing
and should have checked every case.

You'll find the histogram function that deals with weights on the numpy trac
ticket 189, <http://projects.scipy.org/scipy/numpy/ticket/189>
I'm waiting for some hints as to where the histogram function should reside
(numpy.histogram, numpy.stats.histogram, ...) before submitting a patch .

Salut,
David


2006/10/25, Nicolas Champavert <nicolas.champavert at obs.univ-lyon1.fr>:
>
> Hi,
>
>     it would be great if you could add the weight option in the 1D
> histogram too.
>
> Nicolas
>
> David Huard a écrit :
> > Xavier,
> > Here is the patch against svn. Please report any bug. I haven't had
> > the time to test it extensively, something that should be done before
> > commiting the patch to the repo. I'd appreciate your feedback.
> >
> > David
> >
> > 2006/10/24, David Huard <david.huard at gmail.com
> > <mailto:david.huard at gmail.com>>:
> >
> >     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
> >     <mailto: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 <mailto:gnata at obs.univ-lyon1.fr>
> >         ############################################
> >
> >
> >
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