Can you just use the back-substitution phase of an LUD or QR solver? On Tue, Jul 19, 2011 at 9:55 PM, Greg Sterijevski <gsterijev...@gmail.com>wrote:
> Hello, > > I was working on some regression issues when I stumbled into the need to > solve a system like > > R y = b or R'y = b. > > R is an upper or lower triangular, b is a vector. > > Does this functionality exist? If not, can I add it? And where? > > Thanks, > > -Greg >
