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From "Phil Steitz (JIRA)" <>
Subject [jira] [Resolved] (MATH-624) Need a method to solve upper and lower triangular systems
Date Fri, 12 Aug 2011 05:44:27 GMT


Phil Steitz resolved MATH-624.

    Resolution: Fixed

Patch applied in r1156968 with one change:
s/MathRuntimeException.CreateXxx/new Xxx throughout. The former usage is deprecated.
Thanks for the patch!

> Need a method to solve upper and lower triangular systems
> ---------------------------------------------------------
>                 Key: MATH-624
>                 URL:
>             Project: Commons Math
>          Issue Type: New Feature
>    Affects Versions: 3.0
>         Environment: Java
>            Reporter: greg sterijevski
>            Assignee: Phil Steitz
>              Labels: Backsolve, Forwardsolve, LowerTriangular, UpperTriangular
>             Fix For: 3.0
>         Attachments: upperlowermethods, upperlowertests
>   Original Estimate: 0h
>  Remaining Estimate: 0h
> I have run into a need to solve triangular systems. While (as Phil and Ted point out)
I could use the LU and QR decompositions, it seems cleaner to have a couple of static functions
which do this. I am including a patch to provide an implementation and the tests.

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