# [R] Store elements in a list in a triple for loop

katarv katiasmirn at gmail.com
Sat Jul 23 03:10:01 CEST 2011

```Hi,

I have a triple loop that goes through all elements of a list
Lst[[k]][[i,j]] and I want to pick only elements of  Lst[[k]][[i,j]]  > 0.4
or any value. Then I want to store the values of Lst[[k]][[i,j]] together
with their i,j,k values in another list. Say I have Lst[][[4,7]] = 0.6, I
want to store it as a row

[,1] [,2] [,3], [,4]
2   4   7      0.6

I tried using  VoxCorr <- list()  and then inside the loop
VoxCorr[i,i,k] <- list(matrix = matrix (c(k,i ,j,
Lst[[k]][[i,j]]),  nrow = 1, ncol = 4))

Which gives an error. It should be something pretty simple but I don't know
en exact syntax I could use to do it.
Thanks,

Here is the full loop code:

VoxCorr <- list()

for (i in 1:ncol(aaN))
{
for (j in 1:ncol(bbN))
{
for (k in 1:Nlags)

{
if ( Lst[[k]][[i,j]] >=CorrMin ||  Lst[[k]][[i,j]]
<=CorrMin )
{
VoxCorr[i,i,k] <- list(matrix = matrix (c(k,i ,j,
Lst[[k]][[i,j]]),  nrow = 1, ncol = 4))
}
}
}

}

return (VoxCorr)

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```