[R] Loc function in R??

[David Scott]

?which

On Tue, 20 Nov 2007, Barb, Jennifer (NIH/CIT) [E] wrote:

> Does anyone know which function (if any) will return the index of the
> true locations in a Boolean vector?
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> For instance:
>
> A=c(1,3,5,7,4);
>
> B=c(2,4,77,3,3);
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> X=A<B;
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> So X is:
>
>> X
>
> [1]  TRUE  TRUE  TRUE FALSE FALSE
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>
>
> I'd like to know if there is a function that will tell me the locations
> of where the TRUE values are?  for instance a vector that will list that
> the locations are at 1, 2, 3.  This function is sometimes called loc()
> in other languages.
>
>
>
> Thanks,
>
> Jennifer
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> 	[[alternative HTML version deleted]]
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> and provide commented, minimal, self-contained, reproducible code.
>

_________________________________________________________________
David Scott	Department of Statistics, Tamaki Campus
 		The University of Auckland, PB 92019
 		Auckland 1142,    NEW ZEALAND
Phone: +64 9 373 7599 ext 86830		Fax: +64 9 373 7000
Email:	d.scott at auckland.ac.nz

Graduate Officer, Department of Statistics
Director of Consulting, Department of Statistics