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Re: Array comparison [message #32341 is a reply to message #32334]

Wed, 02 October 2002 08:12

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"Sean Raffuse" <sean@me.wustl.edu> writes:

>>
>> I believe that the original poster wanted was the values, and not the
>> indices.
>>
>
> That is indeed true. Actually, I'm not interested in anything but whether
> or not an intersection exists. Neither the values nor the indices are
> important.
>
> I am not doing this on very large arrays. However, I may be doing it many,
> many times.

Another way to do set comparisons is with HISTOGRAM. This method is
used within the set_operations.pro file that David Fanning just
mentioned. It is also used by CMSET_OP, if the dynamic range of
values is small. If the dynamic range is large, then there is a
penalty because a huge histogram is created to store a few values.
CMSET_OP chooses dynamically whether to use the HISTOGRAM or
SORT/UNIQ.

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]

		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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