Hi Ruby, I still do not fully understand your question but what I do in such cases is to construct a very simple array and test the functions. The help of numpy.histogram2d or numpy.histogramdd (for more than two dims) might help here. So I guess, basically you want to ignore the x,y positions and just look at the combined distribution of the Z values? In this case, you would just need the numpy.histogram (the 1d version). Note that the histogram returns the numbers and the bin-borders. bests Samuel On 30.01.2012, at 20:27, Ruby Stevenson wrote:

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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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) ?

  Nadav

________________________________________ 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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