[R] storing matrix(variables) in loop

[Márcio Resende]

Hello R-helpers,
I have the following code that works well, 

b <-list()
for (i in 1:3){
a <- matrix(runif(1),3,3)
b[[i]] <- a
}
b

however, I need to do something similar with two loops and I was looking for
something that would look like

b <- list()
for (i in 1:3){
for (j in 1:4){
a <- matrix(runif(1),3,3)
b[[i,j]] <- a #but this doesn´t work
}
}

Anyway, I wanted "b" to loop like
[[i=1, j=1]]         [[i=1, j=2]]     (...)
a[i=1, j=1]           a[i=1,j=2]      (...)

[[i = 2, j=1]]    (...)
a[i = 2, j = 1]   (...)

(...)

Can anybody help me?
Thanks

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