Dear R-users,
I'm posting a problem I already asked help for some time ago, because I'm
facing that problem once again and even because now, reading that old
e-mail, and the answer recevied, I understand I've not made myself clear.

Here's the question: I need to create an empty list of a specific length to
fill it with a quite large amount of square matrices, which is 602. The
question is that these matrices are created inside a for cycle, and I do not
know how to recall all of them one by one, except by creating an empty list
before the cycle, than assigning for each value of the i index the amtrix
computed to the first element of the empty list.
The fact is that: i've trided to create an empty list with

vector("list",602)

and then putting it in a cycle, but it didn't work. This is the cycle I've
used. To prove it works (and then the cycle itself is not a problem) there's
also the output (i.e. the last square matrix computed).

for (i in unique(elio2$id)){
sub.mu <- exp.mu[exp.mu$id==i,]
D <- matrix(0,nrow( sub.mu),nrow(sub.mu))
diag(D) <- sub.mu$deriv.link
A <- mat.cov[1:nrow(D),1:nrow(D)]
R <- corstr[1:nrow(D),1:nrow(D)]
W <- solve(D)%*%solve(sqrt(A))%*%solve(R)%*%solve(sqrt(A))%*%solve(D)
}

> W
              [,1]          [,2]          [,3]          [,4]
[1,]  3.492489e+02 -7.9324883721  0.0006286788 -0.0031046240
[2,] -7.932488e+00 17.4974625191 -1.7575467817  0.0001403319
[3,]  6.286788e-04 -1.7575467817 17.3227959738 -1.7529916860
[4,] -3.104624e-03  0.0001403319 -1.7529916860 17.2279244622
>

Does anyone knows how to insert each and every matrix like the one above in
a "omnicomprehensive" list? That's because I've to use a function requiring
me to have the matrices I need inside a list.
Thanks in advance, hope it's not a too much stupid problem!
niccolò

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