Hello,
Please keep the discussion on the R-Help list, there's no reason not to.
As for your question, can you be more specific?
Also, take a look at function ?scale.
Rui Barradas
Em 29-01-2013 23:31, Eleonora Schiano escreveu:
i have to do multidimensional scaling.
Can you help me?
2013/1/29
Hello,
The question is a bit confusing.
If you nedd to compute B = X'X, all you have to do is
B <- t(X) %*% X
If you want to compute the other formula, the following avoids loops.
n <- nrow(d)
B <- -d^2/2 - rowSums(d^2)/n - colSums(d^2)/n + sum(d^2)/n^2
Hope this helps,
Rui Barradas
Em 28-
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