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## Re: Singular matrix

**From**: |
Lev |

**Subject**: |
Re: Singular matrix |

**Date**: |
Mon, 3 Oct 2016 15:37:01 +0200 |

On Mon, 3 Oct 2016 09:13:59 -0400
Nir Krakauer <address@hidden> wrote:
>* "If the system is not square, or if the coefficient matrix is*
>* singular, a minimum norm solution is computed."*
>* https://www.gnu.org/software/octave/doc/v4.0.1/Arithmetic-Ops.html*
Yes, thanks. However, I found that Octave did emit a warning at the first
time I run A\B. However, subsequent call of A\B did NOT emit a warning.
I think this is IMHO misleading. Either no warning, or warning each time.
To reproduce this:
>*> A=[1,2;1,2]*
A =
1 2
1 2
>*> B=[10;11]*
B =
10
11
>*> A\B*
warning: matrix singular to machine precision
ans =
2.1000
4.2000
>*> A\B*
ans =
2.1000
4.2000
Lev
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73 de HA5OGL
Op.: Levente