Nothing
full <-
function (v) {
n <- (1 + sqrt(1 + 8 * length(v)))/2
if (abs(n - round(n)) > 1e-07)
stop("Matrix not square.")
n <- round(n)
full <- matrix(0, n, n)
full[lower.tri(full)] <- v
full2 <- t(full)
diag(full2) <- 0
full + full2
}
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