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Re: Inverting indices? [message #2448 is a reply to message #2353]

Wed, 29 June 1994 13:26

robijn
Messages: 18
Registered: June 1994

Junior Member

In article <kkobayas.772907009@husc9.harvard.edu>,
Ken Kobayashi <kkobayas@husc9.harvard.edu> wrote:
>
> Am I making sense? I just need to do j=OPPOSITE(i,10) so that when
> i=[1,3,5] it'll return j=[0,2,4,6,7,8,9].
>
> I couldn't find a built-in routine that does this. I tried the following
> code:
>
> FUNCTION opposite,idx,n
> k = bytarr(n)
> k(idx)=1
> return,where(not k)
> end
>
> but this didn't seem to work for some reason.

A 'false' value in IDL is -1, not 1. So change k(idx)=1 to k(idx)=-1 and
it will work.

Frank
--
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/ / \ Phone (31) 71 275841 Local: Robijn@HL628
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[Message index]

		Inverting indices? By: kkobayas on Wed, 29 June 1994 09:23
		Re: Inverting indices? By: robijn on Wed, 29 June 1994 13:26
		Re: Inverting indices? By: dball on Thu, 07 July 1994 08:57
		Language Documentation; was: Re: Inverting indices? By: caron on Fri, 08 July 1994 08:49

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