[R] short way

Uwe Ligges ligges at statistik.uni-dortmund.de
Tue Aug 29 15:02:07 CEST 2000

Pesl Thomas wrote:
> i want to replace certain values of a matrix.
> i know how to replace them when the values are in a vector.
> i tried the same way for a matrix and got this answer:
> la[la==0]<-1

This works, if la is a matrix.

> Error in [<-.data.frame(*tmp*, la == 0, value = 1) :
>         matrix subscripts not allowed in replacement

And this shows us: la is a data.frame.

 la <- as.matrix(la)
 la[la==0] <- 1

should do the trick.

> i found a way to do this with "for()",
> but i think this is the worst way to do it.
> So is there a better way?

Uwe Ligges
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