[R] programing problem with for( )
(Ted Harding)
Ted.Harding at manchester.ac.uk
Mon Feb 1 12:41:48 CET 2010
On 01-Feb-10 11:29:40, marlene marchena wrote:
> Hi R-users
>
> I'm writing a code to run a fuction but I found an error that I can't
> fix. I
> reproduced the error with a simple example.
>
> The correct answer is k but I can't fill my s matrix. What I'm doing
> wrong?
>
>
> s<-matrix(data=NA,nrow=1,ncol=5 )
> s
>
> for(i in 1:5)
> {
> k=sqrt(i)
> s[,i]<-k[i]
> print(k)
> }
>
> s
>
> Thanks in advance,
> Marlene.
Use s[,i]<-k instead of s[,i]<-k[i] since k=sqrt(i) assigns a
single value to k. Hence k[1] will be the same as k, but for
i>1 k[i] will always be NA.
A better way to do the whole thing (in your example) is simply
s <- sqrt(1:5)
but your example may be a very simple case of a more complex
procedure!
Hoping this helps,
Ted.
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Date: 01-Feb-10 Time: 11:41:46
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