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From Greg Sterijevski <gsterijev...@gmail.com>
Subject [math] Backsolve and Frontsolve
Date Wed, 20 Jul 2011 04:55:57 GMT 
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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