Novice question on A \ b

[John B. Thoo]

Hi.  According to the Octave manual, when using  A \ b,  if the 
coefficient matrix is singular, Octave will print a warning message and 
compute a minimum norm solution.

This is what I tried.


octave:18> A = [ [1, 1, 2, 3]' [0, 0, 4, 4]']; b = [3, 0, -1, 0]'; A \ b
ans =

   1.40000
  -1.00000


I think this is the minimum norm solution, but Octave did not issue a 
warning.  What is wrong with my thinking?

I'm using Octave 2.1.46 (installed with Fink) on Mac OS X 10.3.7.

TIA.

---John.



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