comp.lang.idl-pvwave archive: archive » Re: Vector comparison.

Home » Public Forums » archive » Re: Vector comparison.

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Vector comparison. [message #37129 is a reply to message #37128]

Wed, 19 November 2003 16:09

Pavel Romashkin
Messages: 166
Registered: April 1999

Senior Member

I would use Unique to get the non-repeating values. You can then compare
it with the continuous index of A to see if there are repating values.
Then, I'd use Value_locate function to match B against the unique
sub-array of A.
But Histogram would probably be faster.

Pavel

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]
>
> 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

Report message to a moderator

[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

Previous Topic:	Re: IDLWAVE takes over
Next Topic:	Byte Swapping

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Thu Oct 09 07:37:16 PDT 2025

Total time taken to generate the page: 1.12048 seconds