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Message: [QUOTE="Tom St Denis, post: 1696114"] Well I did but I didn't go into full details. In a class called "Numerical Analysis" at my college we actually study this problem and our required to give the error estimate along with the results. about? In general by pivoting the largest value upwards you help minimize the error. I wasn't trying to give the guy the best possible answer. I was just showing that a basic solution [that will work 99% of the time] is trivial to code. Then you'd be wrong. The point is though that an ideal inversion [which I had to write for college] and the one I described are not far off. Also you're always going to have error. The idea is for well conditioned inputs the inverse shall be precise. Tom [/QUOTE]