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Re: Fast shear [message #29219 is a reply to message #29122]

Wed, 06 February 2002 04:41

the_cacc
Messages: 104
Registered: October 2001

Senior Member

Wayne Landsman <landsman@mpb.gsfc.nasa.gov> wrote in message news:<3C60199D.E4810C70@mpb.gsfc.nasa.gov>...
>
> "Avoid the use of an asterisk on the left-hand side of an assignment."
>
> which in this case means to rewrite the assignment as
>
> for i = 0, n-1 DO array[0,i] = SHIFT(array[*,i],delta[i])
>
> For a fltarr(2048,2048) on my Solaris machine running V5.5, I find a
> factor of 15 improvement in speed.
>

WOW! Wayne, that's magic. I get 10-15X speed-up. The world *has* to be
told about this. One drawback - the code does not strictly make sense,
hell who cares !?

Cheers.

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[Message index]

		Re: Fast shear By: Wayne Landsman on Tue, 05 February 2002 09:42
		Re: Fast shear By: k-bowman on Thu, 07 February 2002 09:41
		Re: Fast shear By: the_cacc on Wed, 06 February 2002 04:41

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