[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
## Octave criterion for matrix singularity

**From**: |
mabalenk |

**Subject**: |
Octave criterion for matrix singularity |

**Date**: |
Mon, 25 Feb 2019 12:34:57 -0600 (CST) |

Dear all,
I'm repeatedly solving a linear system with a Vandermonde matrix. I'm using
a "backslash" operator:
y = -W'/b'
At each iteration I'm increasing the matrix order by one. At some point
Octave issues a warning:
warning: matrix singular to machine precision, rcond = 1.56508e-17
If possible, would you please direct me to the Octave source code, where
this decision is made? I would like to understand the criterion, that
triggers the warning. I found a post on StackOverflow that says MATLAB would
issue a similar warning, once rcond < 1e-12. I would like to know, what
threshold does Octave use and how is it defined. Thank you!
--
Best wishes,
Maxim
--
Sent from: http://octave.1599824.n4.nabble.com/Octave-General-f1599825.html

**Octave criterion for matrix singularity**,
*mabalenk* **<=**