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Re: How to make IDL faster [message #36867 is a reply to message #36775]

Wed, 29 October 2003 11:42

mchinand
Messages: 66
Registered: September 1996

Member

In article <4a097d6a.0310291118.2ceed6d5@posting.google.com>,
M. Katz <MKatz843@onebox.com> wrote:
>
> if geo(0,i,j) gt lat(k)-0.04 and geo(0,i,j) lt lat(k)+0.04 and $
> geo(1,i,j) gt lon(k)-0.04 and geo(1,i,j) lt lon(k)+0.04
>
> to this
>
> if (abs(geo(0,i,j) - lat(k)) LT 0.04) and $
> (abs(geo(1,i,j) - lon(k)) LT 0.04) then . . .
>
> Here I am thinking that you minimize the number of times you have to
> go to the geo() array and get the (0,i,j) element.
>
> M. Katz

Do both conditional clauses always get evaluated, even if the first one is false? If so,
it might be faster to add a second if statement:

if (abs(geo(0,i,j) - lat(k)) LT 0.04) then $
if (abs(geo(1,i,j) - lon(k)) LT 0.04) then print, loc(k), etc...

I haven't tried this on a large dataset, but it might be worth investigating.

--Mike

--
Michael Chinander
m-chinander@uchicago.edu
Department of Radiology
University of Chicago

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[Message index]

		How to make IDL faster By: parkkw on Tue, 28 October 2003 21:35
		Re: How to make IDL faster By: Robert Moss on Sun, 02 November 2003 09:17
		Re: How to make IDL faster By: the_cacc on Mon, 03 November 2003 10:37
		Re: How to make IDL faster By: the_cacc on Fri, 31 October 2003 18:49
		Re: How to make IDL faster By: parkkw on Wed, 29 October 2003 16:35
		Re: How to make IDL faster By: Ken Knapp on Wed, 29 October 2003 13:28
		Re: How to make IDL faster By: mchinand on Wed, 29 October 2003 11:42
		Re: How to make IDL faster By: MKatz843 on Wed, 29 October 2003 11:18

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