#1206 determineSVD gives wrong dimensions in U for m<n

[Anye Li]

Given an m-by-n matrix A, lassign "[::math::linearalgebra::determineSVD $A] U S V" will return an m-by-n matrix U. While this is often what you want for overdetermined systems (m>n), this is not what you want for underdetermined systems (m<n) and is not consistent with any definition of the SVD I know of. If (m<n), the S and V matrices should be truncated if truncation is desired.

Incidentally, sometimes I don't want the U matrix to be truncated when m>n, for example when I am as interested in the residuals than the actual fit.