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Re: Accelerating a one-line program doing matrix multiplication [message #72758 is a reply to message #72662]

Wed, 29 September 2010 07:49

rogass
Messages: 200
Registered: April 2008

Senior Member

On 29 Sep., 12:48, Axel M <axe...@gmail.com> wrote:
> I have to admit that I did not understand this proposed use of
> REPLICATE:
>
>>> sometimes (replicate({temp:input},newsize)).(0) is faster then rebin
>
> But it brought me a related question in mind: does IDL have a
> "REPLICATE" function for vectors instead of scalar values? I am using
> REBIN, but REBIN is thought for more advanced uses and probably
> suboptimal for a "replicate-like" use... right?

Yes, it has as I mentioned uncommented above:

sometimes (replicate({temp:input},newsize)).(0) is faster then rebin

-> this means:

IDL> a=findgen(3)
IDL> print,a
0.000000 1.00000 2.00000
IDL> print, rebin(a,3,5)
0.000000 1.00000 2.00000
0.000000 1.00000 2.00000
0.000000 1.00000 2.00000
0.000000 1.00000 2.00000
0.000000 1.00000 2.00000
IDL> print, (replicate({temp:a},5)).(0)
0.000000 1.00000 2.00000
0.000000 1.00000 2.00000
0.000000 1.00000 2.00000
0.000000 1.00000 2.00000
0.000000 1.00000 2.00000

Regards

CR

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[Message index]

		Re: Accelerating a one-line program doing matrix multiplication By: Axel Martínez on Wed, 29 September 2010 03:48
		Re: Accelerating a one-line program doing matrix multiplication By: Axel Martínez on Wed, 29 September 2010 03:22
		Re: Accelerating a one-line program doing matrix multiplication By: rogass on Tue, 28 September 2010 23:57
		Re: Accelerating a one-line program doing matrix multiplication By: Jeremy Bailin on Tue, 28 September 2010 08:31
		Re: Accelerating a one-line program doing matrix multiplication By: natha on Tue, 28 September 2010 06:10
		Re: Accelerating a one-line program doing matrix multiplication By: Axel Martínez on Mon, 27 September 2010 23:17
		Re: Accelerating a one-line program doing matrix multiplication By: natha on Mon, 27 September 2010 06:31
		Re: Accelerating a one-line program doing matrix multiplication By: rogass on Wed, 29 September 2010 07:49

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