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Re: Array comparison [message #32330]

Wed, 02 October 2002 13:44

mchinand
Messages: 66
Registered: September 1996

Member

In article <Pine.GHP.4.32.0210021447020.18221-100000@icesat2.gsfc.nasa.gov>,
Jeff Guerber <jeff.guerber@gsfc.nasa.gov> wrote:
> On Wed, 2 Oct 2002, Mike Chinander wrote:
>
>> How about:
>>
>> if n_elements(uniq(([a,b])(sort([a,b])))) ne n_elements([a,b]) then print,
>> 'arrays have matching values'
>
> Uhh, doesn't that claim a match if one of the arrays contains two (or
> more) identical elements, even if the arrays have no elements in common?
>
> IDL> a=[1,2,3,4,5]
> IDL> b=[6,6,7]
> IDL> if n_elements(uniq(([a,b])(sort([a,b])))) ne n_elements([a,b]) then
> print,'match'
> match
> IDL>
>
> Jeff Guerber
>
Yeah, I realized this after reading the code from David Fanning's site
that he linked to in this thread. Applying UNIQ to the two arrays prior
to concatenating them should get around this.

--Mike

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

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[Message index]

		Re: Array comparison By: mchinand on Wed, 02 October 2002 13:44
		Re: Array comparison By: Jeff Guerber on Wed, 02 October 2002 12:04
		Re: Array comparison By: Craig Markwardt on Wed, 02 October 2002 08:12
		Re: Array comparison By: R.Bauer on Wed, 02 October 2002 08:09
		Re: Array comparison By: David Fanning on Wed, 02 October 2002 07:53
		Re: Array comparison By: Sean Raffuse on Wed, 02 October 2002 07:34
		Re: Array comparison By: Craig Markwardt on Wed, 02 October 2002 06:19
		Re: Array comparison By: R.Bauer on Wed, 02 October 2002 01:11
		Re: Array comparison By: Craig Markwardt on Tue, 01 October 2002 19:59
		Re: Array comparison By: mchinand on Tue, 01 October 2002 17:07

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