R help - Aug 2011 - Write vector/matrix in a loop

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?*

Thank you!

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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!
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Write-vector-matrix-in-a-loop-tp3747862p3747862.html
> Sent from the R help mailing list archive at Nabble.com.
>
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>


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