# [Numpy-discussion] histogram help

Olivier Delalleau shish@keba...
Thu Feb 2 07:46:00 CST 2012

```Sorry but I don't understand your last question. Better / more efficient
than what?

-=- Olivier

Le 2 février 2012 07:14, Ruby Stevenson <ruby185@gmail.com> a écrit :

> Exactly, histogram of Z, which itself is an array, for each (x, y).
>
> sorry for getting everyone including myself confused :-)
>
> I think I am now using histogram call correctly ... but I now have a
> slightly different question. It maybe better to ask in a different
> subject, but here it is any way:
>
> support I will have a sequence of (x, y), and Z, with x, y are
> coordinates, and Z being an array for third dimension, Is there a
> better or more efficient way to build up this 3-D array?
>
> thanks
>
> Ruby
>
>
>
>
>
>
> On Tue, Jan 31, 2012 at 4:42 AM, Nadav Horesh <nadavh@visionsense.com>
> wrote:
> > Do you want a histogramm of z for each (x,y) ?
> >
> >
> > ________________________________________
> > From: numpy-discussion-bounces@scipy.org [
> numpy-discussion-bounces@scipy.org] On Behalf Of Ruby Stevenson [
> ruby185@gmail.com]
> > Sent: 30 January 2012 21:27
> > To: Discussion of Numerical Python
> > Subject: Re: [Numpy-discussion] histogram help
> >
> > Sorry, I realize I didn't describe the problem completely clear or
> correct.
> >
> > the (x,y) in this case is just many co-ordinates, and  each coordinate
> > has a list of values (Z value) associated with it.  The bins are
> > allocated for the Z.
> >
> > I hope this clarify things a little. Thanks again.
> >
> > Ruby
> >
> >
> >
> >
> > On Mon, Jan 30, 2012 at 2:21 PM, Ruby Stevenson <ruby185@gmail.com>
> wrote:
> >> hi, all
> >>
> >> I am trying to figure out how to do histogram with numpy
> >>
> >> I have a three-dimension array A[x,y,z],  another array (bins) has
> >> been allocated along Z dimension, z'
> >>
> >> how can I get the histogram of H[ x, y, z' ]?
> >>
> >> thanks for your help.
> >>
> >> Ruby
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