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Re: CUDA version of RANDOMN? [message #62003 is a reply to message #62002]

Fri, 15 August 2008 08:16

hotplainrice@gmail.co is currently offline

hotplainrice@gmail.co
Messages: 15
Registered: July 2008

Junior Member

On Aug 16, 12:28 am, wlandsman <wlands...@gmail.com> wrote:
> On Aug 15, 10:11 am, "hotplainr...@gmail.com" <hotplainr...@gmail.com>
> wrote:
>
>
>
>> Hey guys,
>
>> I need to write a kernel to replace the IDL RANDOMN POISSON
>
>> for loop
>> for loop
>> for loop
>> c = data[x,y,b]
>> if c gt 0.0 then begin
>> n = RANDOMN( seedP, POISSON=c )
>> endif else begin
>> n = 0
>> endelse
>> data[x,y,b] = n
>> endfor
>> endfor
>> endfor
>
>> Could someone point out an example code of how RANDOMN POISSON so that
>> I can implement it in CUDA?
>
> Your best bet is to probably look at the Poisson generating algorithm
> in "Numerical Recipes in C" if you are going to implement it CUDA.
>
> I have implemented the "Numerical Recipes in C" algorithm into the IDL
> procedure poidev.pro at http://idlastro.gsfc.nasa.gov/ftp/pro/math/poidev.pro.
> Although poidev.pro is normally slower than calling randomn(POISSON=),
> it has advantages for just the problem you describe, which can be
> written as simply
>
> data = poidev(data)
>
> rather than using a triple FOR loop. --Wayne

Thanks for the reply. I was about to use your code until I discovered
the problem of achieving this.

c = data[x,y,b]
if c gt 0.0 then begin
n = RANDOMN( seedP, POISSON=c )
endif else begin
n = 0
endelse

I guess the only way is to code a poisson kernel and then do tiling on
the data.

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[Message index]

		Re: CUDA version of RANDOMN? By: hotplainrice@gmail.co on Fri, 15 August 2008 17:58
		Re: CUDA version of RANDOMN? By: wlandsman on Fri, 15 August 2008 10:15
		Re: CUDA version of RANDOMN? By: wlandsman on Fri, 15 August 2008 08:28
		Re: CUDA version of RANDOMN? By: hotplainrice@gmail.co on Fri, 15 August 2008 08:16
		Re: CUDA version of RANDOMN? By: hotplainrice@gmail.co on Fri, 15 August 2008 08:14
		Re: CUDA version of RANDOMN? By: wlandsman on Fri, 15 August 2008 07:28

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