QR vs LU factorisation

[Bill Denney]

Dmitri A. Sergatskov wrote:
> Just taking a step back.
>
> One seldom needs an inverse matrix. Usually it is some analytic
> expression, that has an inverse matrix, which has to be calculated
> numerically. Often this expression can be re-written to make use of
> QR (and SVD) decomposition. One good example is well documented
> in wsolve.m
This is true, but some of us don't remember (or didn't know to begin 
with) our linear algebra to this depth.

Have a good day,

Bill