A way to compute a 2d histogram
Xavier Gnata
gnata at obs.univ-lyon1.fr
Tue Nov 14 06:31:41 EST 2006
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?
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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>
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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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Get stuff done quickly with pre-integrated technology to make your job easier
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