A way to compute a 2d histogram

David Huard david.huard at gmail.com
Tue Nov 14 08:53:27 CST 2006


2006/11/14, Xavier Gnata <gnata at obs.univ-lyon1.fr>:
>
> Hi,
>
> IFAICS these new histograms versions have not yet been merged to svn.
> Are they problems to be solve before to be able to merge them?
> How could we help?


No, I'm just overloaded with other stuff, I'll submit a patch on Trac today
or tomorrow. Up to now, Travis did the merges, but since he looks pretty
busy right now, I don't know when it'll show up on svn.

David



Xavier
>
> > Hi,
> >
> > Your histograms functions look fine for me :)
> > As it is a quite usual  operation on an array, I would suggest  to put
> > it in numpy as numpy.histogram. IMHO, there is no point to create an
> > numpy.stats only for histograms (or do you have plans to move other
> > stats related function to numpy.stats?)
> >
> > Xavier.
> >
> >
> >> 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
> >> <mailto: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>
> >>     > <mailto: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>
> >>     >     <mailto: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> <mailto:gnata at obs.univ-lyon1.fr
> >>     <mailto:gnata at obs.univ-lyon1.fr>>
> >>     >         ############################################
> >>     >
> >>     >
> >>     >
> >>
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> --
> ############################################
> 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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