Singular matrices are not invertible. However you can calculate the generalized inverse with the function ginv() from package MASS.
HTH, Jerome On August 14, 2003 09:24 am, Feng Zhang wrote: > Dear R-listers, > > I have a dxr matrix Z, where d > r. > And the product Z*Z' is a singular square matrix. > The problem is how to get the left inverse U of this > singular matrix Z*Z', such that > U*(Z*Z') = I? > > Is there any to figure it out using matrix decomposition method? > > Thanks a lot for your help. > > Fred > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
