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From Ted Dunning <ted.dunn...@gmail.com>
Subject Re: [math] Backsolve and Frontsolve
Date Wed, 20 Jul 2011 05:24:16 GMT
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 <gsterijevski@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
>

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