Re: Octave criterion for matrix singularity

[Tatsuro MATSUOKA]

-- maxim.abalenkov
> 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
> 

You wrote
y=W’/b’

/ is slash.

Is the above a type miss?

Tatsuro