Hi, Dan, Yes, this is what I want. Is there better way to solve this?
Cindy On Mon, Aug 10, 2009 at 2:52 PM, Nordlund, Dan (DSHS/RDA) < nord...@dshs.wa.gov> wrote: > > -----Original Message----- > > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On > > Behalf Of cindy Guo > > Sent: Monday, August 10, 2009 2:32 PM > > To: r-help@r-project.org > > Subject: [R] matrix power > > > > Hi, All, > > > > If I have a symmetric matrix, how can I get the negative square root of > the > > matrx, ie. X^(-1/2) ? > > > > Thanks, > > > > Cindy > > > > Cindy, > > Just to be sure we are all on the same page. Are saying you have a matrix > X, and you want to find the a matrix A such that > > X = A %*% A > > And you want to then find the matrix inverse of A ? > > Dan > > Daniel J. Nordlund > Washington State Department of Social and Health Services > Planning, Performance, and Accountability > Research and Data Analysis Division > Olympia, WA 98504-5204 > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
