[R] Avoiding a Loop?
Uwe Ligges
ligges at statistik.uni-dortmund.de
Fri Jan 21 16:30:27 CET 2005
Rau, Roland wrote:
> Dear R-Helpers,
>
> I have a matrix where the first column is known. The second column is
> the result of multiplying this first column with a constant "const". The
> third column is the result of multiplying the second column with
> "const".....
> So far, I did it like this (as a simplified example):
>
> nr.of.columns <- 4
>
> myconstant <- 27.5
>
> mymatrix <- matrix(numeric(0), nrow=5, ncol=nr.of.columns)
>
> mymatrix[,1] <- 1:5
>
> for (i in 2:nr.of.columns) {
> mymatrix[,i] <- myconstant * mymatrix[,i-1]
> }
nr.of.columns <- 4
myconstant <- 27.5
mycolumn <- 1:5
outer(mycolumn, myconstant^(0:(nr.of.columns-1)))
Uwe Ligges
>
> Can anyone give me some advice whether it is possible to avoid this loop
> (and if yes: how)?
>
> Any suggestions are welcome!
>
> Thanks,
> Roland
>
>
>
>
> +++++
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