| Re: Finding strings values common to two (large!) arrays [message #92202 is a reply to message #92198] |
Wed, 28 October 2015 14:48   |
Dick Jackson
Messages: 347
Registered: August 1998
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Senior Member |
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On Wednesday, 28 October 2015 12:26:30 UTC-7, rrya...@gmail.com wrote:
> Yeah, I learned that trick from your posts on Fanning's webpage. It's been a revelation. But i still don't like the structure of:
>
> id = id[uniq(id,sort(id))]
>
> i wish uniq just had a built-in flag to do this for me... Under what circumstance would I want to *NOT* sort? Seems like if they just built uniq to sort by default, you could probably optimize this at the compiler level --- though I'm hardly an expert...
>
> id = id[uniq(id)] ;would be nice or just
>
> -R
As of IDL 8.4, you can now do this:
IDL> a = [6, 2, 8, 3, 1, 8, 5, 3] ; (first digits of tau)
IDL> a.uniq()
1 2 3 5 6 8
Reference: IDL_Variable::Uniq
http://www.exelisvis.com/docs/IDL_Variable.html#Uniq
Cheers,
-Dick
Dick Jackson Software Consulting Inc.
Victoria, BC, Canada --- http://www.d-jackson.com
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