The problem I am having with Octave seems rather elementary, but I can't seem
to get my head around it. Solving linear equations using the "\" operator,
such as x=A\B, just won't ever work for me.
For example, the following should solve easily, yet my Octave installation
(latest) won't:
octave:17> A=[0,2,0,1;2,2,3,2;4,-3,0,1.;6,1,-6,-5];
octave:18> B=[0;-2;-7;6];
octave:19> inv(A)*B
ans =
-0.50000
1.00000
0.33333
-2.00000
octave:20> A\B
warning: matrix singular to machine precision, rcond = nan
warning: attempting to find minimum norm solution
And there it stops... it'll just sit there and never solve before. I'm
pretty sure I shouldn't be getting those warning messages to being with.