48/50 Linear System Solver

[Manolo Sobrino]

So that was the minimum norm solution! I assumed it was just garbage coming from the LU. I should have calculated it through (don't really do dynamical systems... didn't see that coming.)

I'm used to 20 clear, 21 clear, 22 check. With flag 54 checked I get for the determinant +1.2E-13, and the same solution as Werner. With flag 54 cleared, the determinant is zero and I get Tim's solution.

Looks like the linear solver is a powerful beast indeed, although giving that kind of answer without a warning is kind of mean. If I asked for a Coke, I'm not expecting a Pepsi.

(Please, don't "the user should know better" me... I'm probably using a calculator to solve a 3x3 system because I'm in a hurry, if the system is singular just give it to me straight.)