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Re: Octave criterion for matrix singularity

From: Tatsuro MATSUOKA
Subject: Re: Octave criterion for matrix singularity
Date: Tue, 26 Feb 2019 06:11:58 +0900 (JST)

-- 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

/ is slash.

Is the above a type miss?


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