comp.lang.idl-pvwave archive: archive » Efficient comparison of arrays

Home » Public Forums » archive » Efficient comparison of arrays

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

Efficient comparison of arrays [message #9707]

Fri, 08 August 1997 00:00

Andy Loughe
Messages: 174
Registered: November 1995

Senior Member

Hi!

I feel I should know the answer to this one, but I don't, so here goes.

Given vectors of the type...

a = [1,2,3,4,5]
b = [3,4,5,6,7]

What is the most efficient way to determine which values that occur in
a also occur in b (i.e., the values [3,4,5] occur in both a and b).

Presumably this needs to be done without loops (to be efficient), but an
obvious solution escapes me.

Thanks for your help.

--
Andrew F. Loughe |
afl@cdc.noaa.gov
University of Colorado, CIRES Box 449 |
http://cdc.noaa.gov/~afl
Boulder, CO 80309-0449 | phn:(303)492-0707
fax:(303)497-7013
------------------------------------------------------------ ---------------
"I do not feel obliged to believe that the same God who has endowed us
with
sense, reason, and intellect has intended us to forego their use."
-Galileo

Report message to a moderator

[Message index]

		Efficient comparison of arrays By: Andy Loughe on Fri, 08 August 1997 00:00
		Re: Efficient comparison of arrays By: J.D. Smith on Thu, 14 August 1997 00:00
		Re: Efficient comparison of arrays By: David Foster on Thu, 14 August 1997 00:00
		Re: Efficient comparison of arrays By: William Clodius on Thu, 14 August 1997 00:00
		Re: Efficient comparison of arrays By: William Clodius on Wed, 13 August 1997 00:00
		Re: Efficient comparison of arrays By: J.D. Smith on Wed, 13 August 1997 00:00
		Re: Efficient comparison of arrays By: David Foster on Wed, 13 August 1997 00:00
		Re: Efficient comparison of arrays By: J.D. Smith on Tue, 12 August 1997 00:00
		Re: Efficient comparison of arrays By: J.D. Smith on Mon, 11 August 1997 00:00
		Re: Efficient comparison of arrays By: davidf on Mon, 11 August 1997 00:00
		Re: Efficient comparison of arrays By: davidf on Mon, 11 August 1997 00:00
		Re: Efficient comparison of arrays By: John Votaw on Wed, 20 August 1997 00:00

Previous Topic:	Animations to mpeg/fli
Next Topic:	performing a TVRD() on 24 bit images...

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 19:32:37 PDT 2025

Total time taken to generate the page: 0.01066 seconds