Nothing
normalize <-
function(x)
{
x[is.na(x)] <- 0
if(is.matrix(x)==T) norm.x <- sweep(x, 2, apply(x, 2, function(k) max(k, na.rm=T)), "/")
if(is.matrix(x)==F) norm.x <- x/max(x, na.rm=T)
norm.x[is.na(norm.x)] <- 0
norm.x
}
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