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Re: Efficient comparison of array location in two lists [message #75211]

Tue, 22 February 2011 02:18

Heinz Stege
Messages: 189
Registered: January 2003

Senior Member

The code above contains errors. Wayne Landsman shows an example in
another thread. Here is a copy from my correction:

Good morning!

I should not answer to postings in the middle of the night. I copied
the commands from an existing program in my library and made mistakes
addopting them to the OPs question. Thank you Wayne, for bringing it
out.

And here is the correction:

indx1=sort(foo1)
if n_elements(foo1) ge 2 then $
indx1=indx1[value_locate(foo1[indx1],foo2)] $
else $
indx1=0
indx2=where(foo1[indx1] eq foo2,count)
if count le 0 then message,'No matching labels found.'
indx1=indx1[indx2]

Note, that you have to make changes, if you set the strictarrsubs or
idl2 compiler option. For this case:

indx1=sort(foo1)
if n_elements(foo1) ge 2 then $
indx1=indx1[value_locate(foo1[indx1],foo2)>0] $
else $
indx1=lonarr(n_elements(foo2))
indx2=where(foo1[indx1] eq foo2,count)
if count le 0 then message,'No matching labels found.'
indx1=indx1[indx2]

I hope, that it is working now. Sorry to everybody.

Heinz

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[Message index]

		Re: Efficient comparison of array location in two lists By: Heinz Stege on Tue, 22 February 2011 02:18
		Re: Efficient comparison of array location in two lists By: Heinz Stege on Tue, 22 February 2011 02:16
		Re: Efficient comparison of array location in two lists By: Jeremy Bailin on Mon, 21 February 2011 21:21
		Re: Efficient comparison of array location in two lists By: wlandsman on Mon, 21 February 2011 20:02
		Re: Efficient comparison of array location in two lists By: David Fanning on Mon, 21 February 2011 19:17
		Re: Efficient comparison of array location in two lists By: Heinz Stege on Mon, 21 February 2011 18:45
		Re: Efficient comparison of array location in two lists By: wlandsman on Mon, 21 February 2011 16:43

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