On 12-10-02 5:51 AM, Rui Esteves wrote:
Hello,
I have a matrix with values, with columns c1..cn.
I need the values to be normalized between 0 and 1 by column.
Therefor, the 0 should correspond to the minimum value in the column c1 and
1 should correspond to the maximum value in the column c1.
The remaining columns should be organized in the same way.
Does a function in R exists for this purpose?
No, but it is easy to construct one using sweep. First subtract column
mins, then divide by column maxes:
normalize <- function(x) {
x <- sweep(x, 2, apply(x, 2, min))
sweep(x, 2, apply(x, 2, max), "/")
}
Duncan Murdoch
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