[R] Write vector/matrix in a loop

[Ista Zahn]

Hi,

On Tue, Aug 16, 2011 at 1:31 PM, kokavolchkov <kokavolchkov at gmail.com> wrote:
> Hello!
>
> I'm trying to *save values* (*row and col*) in two matrices(1,m) or vectors.
> I have a loop, where a get these values:
>
> for(i in 144){
>        for(j in 73){
>                if(B4[i,j]==1){ # B4 is a matrix(73, 144)
>                        row <- B4[i-(i-1),j]
>                        col <- B4[i,j-(j-1)]
>                }
>        }
> }
>
> *How to save row and col?*

Create an object to hold them, and use indexing to assign individual values:

rows <- vector()
cols <- vector()

for(i in 144){
       for(j in 73){
               if(B4[i,j]==1){ # B4 is a matrix(73, 144)
                       rows[i] <- B4[i-(i-1),j]
                       cols[i] <- B4[i,j-(j-1)]
               }
       }
}

Best,
Ista

>
> Thank you!
>
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-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org