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Re: IDL Question - Opposite of WHERE? [message #35461 is a reply to message #35320]

Wed, 11 June 2003 18:21

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Chad Bender <cbender@hapuna.ess.sunysb.edu> writes:
> zygnus <suicidal_10@yahoo.com> wrote:
> : is there a command that does the opposite of the WHERE command?
> : Instead of returning the indeces of elements that satisfy a condition,
> : it returns the ones that dont satisfy it
>
> Try using the 'COMPLEMENT' keyword with where. It should return
> an array containing the elements not returned in the result output.

Adding my tidbit:

COMPLEMENT is really useful when you want to know the indices of
*both* the true and the false values of your selection. If you just
want the false values, then as James said, you can simply negate the
selection expression.

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		IDL Question - Opposite of WHERE? By: suicidal_10 on Wed, 11 June 2003 15:28
		Re: IDL Question - Opposite of WHERE? By: David Fanning on Thu, 12 June 2003 07:26
		Re: IDL Question - Opposite of WHERE? By: R.G. Stockwell on Thu, 12 June 2003 04:37
		Re: IDL Question - Opposite of WHERE? By: Craig Markwardt on Wed, 11 June 2003 18:21
		Re: IDL Question - Opposite of WHERE? By: Mark Hadfield on Wed, 11 June 2003 17:25
		Re: IDL Question - Opposite of WHERE? By: Chad Bender on Wed, 11 June 2003 16:41
		Re: IDL Question - Opposite of WHERE? By: James Kuyper on Wed, 11 June 2003 15:51

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