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Re: Select values from one array that match multiple values from an other array [message #82216 is a reply to message #82215]

Fri, 30 November 2012 07:36

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

David Fanning writes:

>
> PMagdon writes:
>
>> I tried to use WHERE for multiple comparisons of two arrays.
>>
>> Here is a minimal example:
>>
>> 1.) Two arrays
>>
>> A=[1,3,2,5,2,6,1,9]
>> B=[1,5]
>>
>> 2.) I need to extract all positions of A where any of the values from B occur in A. So that C should look like this:
>>
>> C=[0,3,6]
>>
>> So far I tested
>> C=WHERE(A EQ B) but this doesn't work.
>>
>> Any ideas how to solve that without looping over B?
>
> c = SetIntersection(a, b)
>
> http://www.idlcoyote.com/tips/set_operations.html

Whoops! You wanted positions. Nevermind. :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Select values from one array that match multiple values from an other array By: Craig Markwardt on Fri, 30 November 2012 08:32
		Re: Select values from one array that match multiple values from an other array By: David Fanning on Fri, 30 November 2012 08:22
		Re: Select values from one array that match multiple values from an other array By: PMagdon on Fri, 30 November 2012 08:13
		Re: Select values from one array that match multiple values from an other array By: David Fanning on Fri, 30 November 2012 07:57
		Re: Select values from one array that match multiple values from an other array By: David Fanning on Fri, 30 November 2012 07:36
		Re: Select values from one array that match multiple values from an other array By: David Fanning on Fri, 30 November 2012 07:31
		Re: Select values from one array that match multiple values from an other array By: David Fanning on Thu, 13 December 2012 08:35

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