Nothing
blowup <-
function(x, M, number = 0) {
y <- array(number, dim = c(M, M))
nr <- nrow(x)
nc <- ncol(x)
dr <- (M - nr) %/% 2
dc <- (M - nc) %/% 2
y [(dr+1):(dr+nr), (dc+1):(dc+nc)] <- x
return(y)
}
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