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Re: fast array comparison [message #33156 is a reply to message #33152]

Sun, 08 December 2002 17:39

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"Sean Raffuse" <sean@me.wustl.edu> writes:
> David,
>
> Thanks for this. It works almost perfectly. I am a little confused though.
> It seems that the indices keyword returns the indices of the requested array
> and not the available array.

Greetings Sean--

Another option is CMSET_OP from my web page. It uses the HISTOGRAM
technique, if the dynamic range of values is small, but graduates to a
different, sort/uniq-based method, if the dynamic range is large.
Indices can be returned using the /INDEX keyword. [ In case it isn't
obvious, you want to use the 'AND' operation. ]

CMSET_OP also returns indices from the *first* array. This is not a
problem for your application, since you can simply swap the positions
of the first and second arrays in the function call.

Yours,
Craig

http://cow.physics.wisc.edu/~craigm/idl/idl.html (under Array/Set Ops)

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[Message index]

		Re: fast array comparison By: JD Smith on Mon, 09 December 2002 09:59
		Re: fast array comparison By: David Fanning on Mon, 09 December 2002 08:07
		Re: fast array comparison By: David Fanning on Mon, 09 December 2002 08:00
		Re: fast array comparison By: Sean Raffuse on Mon, 09 December 2002 07:48
		Re: fast array comparison By: JD Smith on Mon, 09 December 2002 07:25
		Re: fast array comparison By: Sean Raffuse on Mon, 09 December 2002 07:24
		Re: fast array comparison By: Craig Markwardt on Sun, 08 December 2002 17:39
		Re: fast array comparison By: David Fanning on Sun, 08 December 2002 12:47
		Re: fast array comparison By: David Fanning on Sun, 08 December 2002 12:40
		Re: fast array comparison By: Sean Raffuse on Sun, 08 December 2002 12:35
		Re: fast array comparison By: Sean Raffuse on Sun, 08 December 2002 12:32
		Re: fast array comparison By: David Fanning on Sun, 08 December 2002 09:45

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