On 7/19/11 9:55 PM, Greg Sterijevski 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?
As Ted pointed out, you may be able to somewhat awkwardly get what you need from either the QR or LU decomp embedded Solver implementations. If you have the need, itch and time, I would be +1 to cleanly encapsulate direct back/front solving methods (with the appropriate zoo of double[] and matrix operands - see the DecompositionSolver interface) into either a DirectSolver class or as utility methods added to MatrixUtils. The latter might make replacement of the (duplicate) impls in the decomp solvers and other applications easier. Others may have different / better ideas on this. Phil > > Thanks, > > -Greg > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
