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Re: Mode and variation of cells in multiple grids (3-D problem) [message #69625]

Fri, 29 January 2010 04:58

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On Jan 28, 10:47 am, Ed Hyer <ejh...@gmail.com> wrote:
> On Jan 26, 8:37 pm, Jeremy Bailin <astroco...@gmail.com> wrote:
>
>>> ; map values into their index in uniqvals so we only need to
>>> ; deal with integers
>>> mappedgrids = value_locate(uniqvals, allgrids)
>>> ; now we can use histogram!
>>> ; first give each pixel its own increment so that the histogram for
>>> ; the pixels run from 0..nuniq-1, nuniq..2*nuniq-1, etc.
>>> pixincrement = ((lindgen(gridsize[0]) # replicate(1,gridsize[1])) + $
>>> (lindgen(gridsize[1]) ## replicate(1,gridsize[0]) * gridsize[0])) *
>>> nuniq
>
> :slow clap:
>
> Nicely done!

Thanks. :-)=

You might run into memory problems if nuniq is much greater than the
number of grids, since the histogram ends up being nuniq x nx x ny but
only at most ngrid x nx x ny of the elements can be non-zero. I've
been thinking about ways around that, but it gets complicated!

-Jeremy.

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[Message index]

		Re: Mode and variation of cells in multiple grids (3-D problem) By: Jeremy Bailin on Fri, 29 January 2010 04:58
		Re: Mode and variation of cells in multiple grids (3-D problem) By: MarioIncandenza on Thu, 28 January 2010 07:47
		Re: Mode and variation of cells in multiple grids (3-D problem) By: Jeremy Bailin on Tue, 26 January 2010 20:37
		Re: Mode and variation of cells in multiple grids (3-D problem) By: Jeremy Bailin on Tue, 26 January 2010 13:56
		Re: Mode and variation of cells in multiple grids (3-D problem) By: MarioIncandenza on Mon, 25 January 2010 16:49

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