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Re: multiplication [message #19600 is a reply to message #19427]

Thu, 30 March 2000 00:00

Harald Frey
Messages: 41
Registered: March 1997

Member

"J.D. Smith" wrote:

>
> Loop Method:
>
> % Loop limit expression too large for loop variable type.
> <LONG ( 99999)>.
>
> Log Method:
>
> Average Time: 0.050116260
> 7.92382e+10
>
>
> Morals: IDL loops are pitifully slow, and you can't loop over very large arrays
> without trickery, and for many operations, compiled C is *significantly* faster.
>
> --
> J.D. Smith |*| WORK: (607) 255-5842
> Cornell University Dept. of Astronomy |*| (607) 255-6263
> 304 Space Sciences Bldg. |*| FAX: (607) 255-5875
> Ithaca, NY 14853 |*|

You can ideed loop over very large arrays. But I think what you tried to do was something
like

for i=0,1000000l do j=i

% Loop limit expression too large for loop variable type.
<LONG ( 1000000)>.
% Execution halted at: $MAIN$

But if you change your code slightly you get a good result:

for i=0l,1000000l do j=i

Harald

=========================================================
Harald U. Frey
Space Sciences Lab phone: 510-643-3323
University of California fax: 510-643-2624
Berkeley, CA 94720-7450 email: hfrey@ssl.berkeley.edu

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[Message index]

		multiplication By: marc schellens[1] on Tue, 28 March 2000 00:00
		Re: multiplication By: Harald Frey on Thu, 30 March 2000 00:00
		Re: multiplication By: James Kuyper on Wed, 29 March 2000 00:00
		Re: multiplication By: meron on Tue, 28 March 2000 00:00
		Re: multiplication By: John-David T. Smith on Tue, 28 March 2000 00:00
		Re: multiplication By: Craig Markwardt on Tue, 28 March 2000 00:00
		Re: multiplication By: Carsten Dominik on Tue, 28 March 2000 00:00
		Re: multiplication By: James Kuyper on Tue, 28 March 2000 00:00

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