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Re: Sorting (big) int array: Eliminate for loop [message #68047]

Tue, 22 September 2009 05:15

Luds
Messages: 7
Registered: September 2009

Junior Member

On Sep 21, 5:37 pm, greg <greg.a...@googlemail.com> wrote:
> How about this...
>
> pro test
> a=['I','E','F','D','A','J','C','B','G','H']
> b=['E','B','I','J','D','A','C','H','F','G']
>
> qa=sort(a)
> qb=sort(b)
> qa2=sort(qa)
> elements=qb[qa2]
>
> print,b[elements]
> end
>
> IDL> test
> I E F D A J C B G H
>
> Sortingthe sorted indices is the trick. I think it's right, but it
> makes my head hurt anyway.
>
> regards,
> Greg

Perfect, thanks. This works great. Having to do a couple sorts doesn't
add too much overhead to my code. It's much faster now.

By the looks of it the value_locate function could do the trick too,
but it seems to want one of the arrays sorted anyway, which isn't the
case for me.

Thanks for the advice guys. Very helpful.

A

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[Message index]

		Re: Sorting (big) int array: Eliminate for loop By: Luds on Tue, 22 September 2009 05:15
		Re: Sorting (big) int array: Eliminate for loop By: greg.addr on Mon, 21 September 2009 08:37
		Re: Sorting (big) int array: Eliminate for loop By: Brian Larsen on Mon, 21 September 2009 08:29

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