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Re: binning a point clouds in the xy plane [message #87019 is a reply to message #87017]

Fri, 20 December 2013 16:06

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Nafiseh M writes:

> thanks a lot for the answer,
>
> But I thought with indicesz, i would have my new x and y for mean z values. I cannot figure it how can I calculate them?

Are you talking about how you calculate the new X and Y vectors that
describe the binned data? I think I would do it like this. Given that
you have this (and note I'm leaving out the max values since they will
not be used if you are specifying the bin size, as you are):

hist_xy=hist_nd(transpose([[x],[y]]),[0.05,0.05],$
min=[min(x),min(y)], reverse_indices=ri)

I would do this, where I add half a bin size to put the X and Y vector
values in the center of the bin:

dims = Size(hist_xy, /Dimensions)
xvector = Findgen(dims[0])*0.05 + Min(x) + 0.025
yvector = Findgen(dims[1])*0.05 + Min(y) + 0.025

> when I write
> print, indicesz
> I will get just some number which I don't know what are they.

They are the indices of the Z values that were placed into that bin.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		binning a point clouds in the xy plane By: Nafiseh Masoumzadeh on Thu, 19 December 2013 13:53
		Re: binning a point clouds in the xy plane By: David Fanning on Thu, 19 December 2013 14:13
		Re: binning a point clouds in the xy plane By: Nafiseh Masoumzadeh on Thu, 19 December 2013 16:11
		Re: binning a point clouds in the xy plane By: David Fanning on Thu, 19 December 2013 16:20
		Re: binning a point clouds in the xy plane By: Nafiseh Masoumzadeh on Fri, 20 December 2013 15:03
		Re: binning a point clouds in the xy plane By: David Fanning on Fri, 20 December 2013 16:06
		Re: binning a point clouds in the xy plane By: Nafiseh Masoumzadeh on Thu, 23 January 2014 07:48
		Re: binning a point clouds in the xy plane By: Nafiseh Masoumzadeh on Fri, 20 December 2013 15:01

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