Thank, Jerome The question is if this generalized inverse can make their product to be identity matrix?
----- Original Message ----- From: "Jerome Asselin" <[EMAIL PROTECTED]> To: "Feng Zhang" <[EMAIL PROTECTED]>; "R-Help" <[EMAIL PROTECTED]> Sent: Thursday, August 14, 2003 11:52 AM Subject: Re: [R] How to get the pseudo left inverse of a singular square matrix? > > 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
