[R] PC rotation question

Sasha Pustota popgen at gmail.com
Fri May 26 00:03:32 CEST 2006

On p. 48 of "Statistics Complements" to the 3rd MASS edition,

I read that the orthogonal rotations of Z Lambda^-1 remain
uncorrelated, where Z is the PC and Lambda is the diag matrix of
singular values.

However, the example below that text is

   > A <- loadings(ir.pca) %*% diag(ir.pca$sdev)

If ir.pca$sdev are the singular values, should that be diag(1 /
ir.pca$sdev), or is it some discrepancy between S+ and R that I'm

More information about the R-help mailing list