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Re: array convol optimizationv slow now [message #67364 is a reply to message #67287]

Tue, 14 July 2009 14:15

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On Jul 13, 6:40 pm, newerjazz <shang...@gmail.com> wrote:
> Hi All,
>
> I have an array of [2,100,000,000] corresponding to x, y and
> 100,000,000 particles. I need to render these particles as gasussian
> spots at x, y locations
>
> Currently, I run a for loop through each particle and render each
> particle in this for loop; it takes forever.
>
> I am thinking to create an array of zeroes. at each location where
> there's particles, I increment the value by 1. Then use convol to draw
> gaussian spot.
>
> Any suggestion to implement this!
>
> Thanks a lot!
>
> newerjazz

You might want to try POINT_CONVOLVE:

http://web.astroconst.org/jbiu/jbiu-doc/math/point_convolve. html

Check out the various keywords... depending on your resolution, number
of dimensions, and number of points, different combinations will give
you the best optimization.

-Jeremy.

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[Message index]

		array convol optimizationv slow now By: newerjazz on Mon, 13 July 2009 15:40
		Re: array By: Chris[6] on Thu, 16 July 2009 12:20
		Re: array convol optimizationv slow now By: Jeremy Bailin on Tue, 14 July 2009 14:15

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