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Re: Finding strings values common to two (large!) arrays [message #92079 is a reply to message #92078]

Wed, 07 October 2015 07:45

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Wednesday, October 7, 2015 at 4:13:59 PM UTC+2, rj...@le.ac.uk wrote:
> I have arrays of numerical IDs in string format.
>
> I want to find all of the indices in Array A that contain a value that is present anywhere in Array B.
>
> The arrays are both quite large (>1 million values) so a loop is out of the question and them being strings complicates it as well.
>
> Any IDL Way tips?

Interesting... I guess that a set operation will do or in other words, you want to find (A) AND (B)
Did you look at David's page:
https://www.idlcoyote.com/tips/set_operations.html

There are some good tips, among which Craig's CMSET_OP which works also on strings (but does not return indices...).

I hope it helps.

Cheers,
Helder

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[Message index]

		Finding strings values common to two (large!) arrays By: rjp23 on Wed, 07 October 2015 07:13
		Re: Finding strings values common to two (large!) arrays By: Helder Marchetto on Wed, 07 October 2015 07:45
		Re: Finding strings values common to two (large!) arrays By: wlandsman on Wed, 07 October 2015 08:09
		Re: Finding strings values common to two (large!) arrays By: rjp23 on Wed, 07 October 2015 08:21
		Re: Finding strings values common to two (large!) arrays By: Lajos Foldy on Wed, 07 October 2015 09:17
		Re: Finding strings values common to two (large!) arrays By: rjp23 on Wed, 07 October 2015 12:57
		Re: Finding strings values common to two (large!) arrays By: Craig Markwardt on Wed, 07 October 2015 15:19
		Re: Finding strings values common to two (large!) arrays By: rjp23 on Thu, 08 October 2015 04:40
		Re: Finding strings values common to two (large!) arrays By: Jeremy Bailin on Wed, 28 October 2015 09:00
		Re: Finding strings values common to two (large!) arrays By: Russell[1] on Wed, 28 October 2015 09:25
		Re: Finding strings values common to two (large!) arrays By: Jeremy Bailin on Wed, 28 October 2015 09:40
		Re: Finding strings values common to two (large!) arrays By: Russell[1] on Wed, 28 October 2015 12:26
		Re: Finding strings values common to two (large!) arrays By: Dick Jackson on Wed, 28 October 2015 14:48
		Re: Finding strings values common to two (large!) arrays By: Dick Jackson on Wed, 28 October 2015 14:53
		Re: Finding strings values common to two (large!) arrays By: Jeremy Bailin on Thu, 29 October 2015 11:17
		Re: Finding strings values common to two (large!) arrays By: Dick Jackson on Thu, 29 October 2015 15:47

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