Problem With Solving Matrix Equations

[MoneyHaus]

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.

Any help would be greatly appreciated!

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