R help - Aug 2003 - question for loop on matrix row level.

For the 1000 simulations, a matrix will be generated
each time. And, I need to choose the first row of the
generated matrix. The following loop doesn't work
though:

for (i in 1:1000) {

aval[i]<- matrixname[1,]

}

Any solution? thanks!

Have you considered making "aval" an array with the same number of 
columns as "matrixname"?  Try the following:

aval <- array(NA, dim=c(2,2))
for(i in 1:2){
	matrixname <- array(i+(1:4), dim=c(2,2))
	aval[i,] <- matrixname[1,]
}
aval

hope this helps.  spencer graves

Lily wrote:
> For the 1000 simulations, a matrix will be generated
> each time. And, I need to choose the first row of the
> generated matrix. The following loop doesn't work
> though:
> 
> for (i in 1:1000) {
> 
> aval[i]<- matrixname[1,]
> 
> }
> 
> Any solution? thanks!
> 
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