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Re: Extract Array positions for a set of Values [message #75435 is a reply to message #75434]

Wed, 09 March 2011 03:08

wlandsman
Messages: 743
Registered: June 2000

Senior Member

You might try match2.pro from http://idlastro.gsfc.nasa.gov/ftp/pro/misc/match2.pro though it is a bit of overkill.

(You first have to REFORM to a 1-d array)

IDL> match2,reform(a,21),b,suba,subb

IDL> print,reform(suba,7,3)
0 0 0 0 -1 -1 -1
0 0 0 0 -1 -1 1
-1 -1 -1 -1 2 -1 1

The output is set to -1 where there is no match in the vector B.

IDL> a[where(suba ge 0)] = 99
IDL> print,a
99 99 99 99 0 0 0
99 99 99 99 0 0 99
0 0 0 0 99 0 99

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[Message index]

		Re: Extract Array positions for a set of Values By: wlandsman on Thu, 10 March 2011 06:54
		Re: Extract Array positions for a set of Values By: Jeremy Bailin on Thu, 10 March 2011 05:49
		Re: Extract Array positions for a set of Values By: Gray on Wed, 09 March 2011 13:29
		Re: Extract Array positions for a set of Values By: Jeremy Bailin on Wed, 09 March 2011 06:37
		Re: Extract Array positions for a set of Values By: wlandsman on Wed, 09 March 2011 03:08

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