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Re: [Q]IDL: Using WHERE. [message #5979 is a reply to message #5973]

Tue, 19 March 1996 00:00

Andy Loughe
Messages: 174
Registered: November 1995

Senior Member

Joe Fitzgerald wrote:
>
> Where finds the non-zero elements of an array; e.g.

Huh?
If array=[30, 40, 10, 0]? Then B=[0,1]
If array=dist(10)-50., then B=-1

> array = FINDGEN(100)
> B = Where(array GT 20., count)
> B is an array containing the subscripts of ARRAY for values greater than
> 20.

Yes. If there are any (see above example)!

> Is there a way to use B to get the complementary values; i.e., the array
> of subscripts for which ARRAY is less than 20?

Uh! This is a set-up, isn't it?
Is my boss watching?
How about LESS THAN OR EQUAL TO? That would be complementary.

Why use B? Why not use...
C = Where(array LE 20., count)
if (count gt 0) then print, 'Hurray!'

If you must use B, then try using the uniq function.

--
Andrew F. Loughe (afl@cdc.noaa.gov)
University of Colorado, CIRES * Campus Box 449 * Boulder, CO 80309
phone: (303) 492-0707 fax: (303) 497-7013

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[Message index]

		Re: [Q]IDL: Using WHERE. By: steinhh on Fri, 22 March 1996 00:00
		Re: [Q]IDL: Using WHERE. By: Paul Schopf on Thu, 21 March 1996 00:00
		Re: [Q]IDL: Using WHERE. By: Thomas A. McGlynn on Thu, 21 March 1996 00:00
		Re: [Q]IDL: Using WHERE. By: Mirko Vukovic on Wed, 20 March 1996 00:00
		Re: [Q]IDL: Using WHERE. By: rivers on Wed, 20 March 1996 00:00
		Re: [Q]IDL: Using WHERE. By: Andy Loughe on Tue, 19 March 1996 00:00

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