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Re: Vector comparison. [message #37126 is a reply to message #37124]

Wed, 19 November 2003 17:50

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

hunter wrote:

> Hello,
>
> These seems to be a fairly simple problem but I'm having difficulty coming
> up with an elegant solution.
>
> Let's say I have two vectors of type integer:
>
> A=[0,1,3,3,3,6,7,9,9]
> B=[3,7]
>
Dear Eli

Here are some useful routines

http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/download/a_and_b.tgz
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/download/a_or_b.tgz
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/download/a_not_b.tgz
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/download/a_xor_b.tgz
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/download/veklogik.tgz
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/download/indexlogic.tgz

print,a_and_b(a,b)
3 7
print,a_or_b(a,b)
0 1 3 6 7 9
print,a_not_b(a,b)
0 1 6 9
print,a_xor_b(a,b)
0 1 6 9

veklogic
This function applies different boolean operators to two vectors. It's a
wrapper for the functions a_and_b, a_or_b, a_xor_b, a_not_b

indexlogic
This function applies different boolean operators to two index vectors. This
routine is much faster then VekLogik but can only used with index vectors.

For some more routine please have a look at
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_lib_intro. html

regards

Reimar

> I would like to design a function which returns the indices of all the
> elements of A which appear in B.
>
> i.e.
>
> C=get_match(A,B)
>
> should return
>
> C=[2,3,4,6]
>
> The simplest answer (I believe) is to loop through B and use the where
> command. I just wonder if there is a way to do this without useing the
> loop, as (in reality) the length of B may be very large.
>
> I suppose another possibility is to use the histogram command with
> reverse_indices set. But I think this would still require me to use a
> loop. Although it may be faster since I would only have to call histogram
> once. Any thoughts?
>
> Thanks,
> Eli

--
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg-i/
============================================================ ======
a IDL library at ForschungsZentrum Juelich
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_lib_intro. html

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[Message index]

		Re: Vector comparison. By: JD Smith on Thu, 20 November 2003 11:38
		Re: Vector comparison. By: tam on Thu, 20 November 2003 10:55
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 09:55
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 09:35
		Re: Vector comparison. By: tam on Thu, 20 November 2003 09:24
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 08:52
		Re: Vector comparison. By: Chris[1] on Thu, 20 November 2003 08:08
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 08:08
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 07:11
		Re: Vector comparison. By: tam on Thu, 20 November 2003 07:03
		Re: Vector comparison. By: hunter on Thu, 20 November 2003 06:49
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 05:40
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 04:02
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 02:19
		Re: Vector comparison. By: Chris Lee on Thu, 20 November 2003 02:09
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 01:01
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 00:23
		Re: Vector comparison. By: David Fanning on Wed, 19 November 2003 18:05
		Re: Vector comparison. By: R.Bauer on Wed, 19 November 2003 17:50
		Re: Vector comparison. By: Craig Markwardt on Wed, 19 November 2003 15:48
		Re: Vector comparison. By: Pavel Romashkin on Wed, 19 November 2003 16:09

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