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Re: Accelerating a one-line program doing matrix multiplication [message #72756 is a reply to message #72696]

Wed, 29 September 2010 08:34

pgrigis
Messages: 436
Registered: September 2007

Senior Member

>
> [skip]
>
> 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

Another option is:
a#(fltarr(5)+1)

But I would expect this to be slower...

Ciao,
Paolo

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[Message index]

		Accelerating a one-line program doing matrix multiplication By: Axel Martínez on Mon, 27 September 2010 02:18
		Re: Accelerating a one-line program doing matrix multiplication By: Axel Martínez on Thu, 30 September 2010 09:38
		Re: Accelerating a one-line program doing matrix multiplication By: pgrigis on Thu, 30 September 2010 08:03
		Re: Accelerating a one-line program doing matrix multiplication By: pgrigis on Thu, 30 September 2010 07:59
		Re: Accelerating a one-line program doing matrix multiplication By: Axel Martínez on Thu, 30 September 2010 04:05
		Re: Accelerating a one-line program doing matrix multiplication By: Axel Martínez on Thu, 30 September 2010 02:41
		Re: Accelerating a one-line program doing matrix multiplication By: Axel Martínez on Thu, 30 September 2010 01:39
		Re: Accelerating a one-line program doing matrix multiplication By: Karl[1] on Wed, 29 September 2010 09:57
		Re: Accelerating a one-line program doing matrix multiplication By: pgrigis on Wed, 29 September 2010 09:05
		Re: Accelerating a one-line program doing matrix multiplication By: Axel Martínez on Wed, 29 September 2010 08:55
		Re: Accelerating a one-line program doing matrix multiplication By: penteado on Wed, 29 September 2010 08:45
		Re: Accelerating a one-line program doing matrix multiplication By: pgrigis on Wed, 29 September 2010 08:34
		Re: Accelerating a one-line program doing matrix multiplication By: Axel Martínez on Wed, 29 September 2010 08:24

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