[R] Loc function in R??

[Benilton Carvalho]

which(A < B)


On Nov 20, 2007, at 3:06 PM, 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?
>
>
>
> For instance:
>
> A=c(1,3,5,7,4);
>
> B=c(2,4,77,3,3);
>
> X=A<B;
>
>
>
> So X is:
>
>> X
>
> [1]  TRUE  TRUE  TRUE FALSE FALSE
>
>
>
> 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
>
>
>
>
>
>
>
>
>
>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.