[Rd] transpose of complex matrices in R

From: Prof. John C Nash <nashjc_at_uottawa.ca>
Date: Fri, 30 Jul 2010 11:39:41 -0400

> When one is working with complex matrices, "transpose" very nearly
> always means
> *Hermitian* transpose, that is, A[i,j] <- Conj(A[j,i]).
> One often writes A^* for the Hermitian transpose.

I believe that I have actually (many years ago) used a true complex transpose, but I agree that one more often needs the conjugate transpose. I would not be in favour of changing t() because I feel transpose means transpose -- certainly where there are non-square matrices. But I'd be in favour of adding a conjt() (or some similar function) that does the conjugate transpose efficiently.


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