Nothing
expan <- function(d) {
E <- matrix(0, d ^ 2, d * (d + 1) / 2)
for (i in 1:d) {
for (j in 1:d) {
if (j >= i) {
E[d * (i - 1) + j, (2 * d - i) / 2 * (i - 1) + j] <- 1
} else {
E[d * (i - 1) + j, (2 * d - j) / 2 * (j - 1) + i] <- 1
}
}
}
return(E)
}
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