[petsc-users] Information on SNES

[Barry Smith]

  It is documented in the manual page for SNESConvergedDefault


> On Sep 29, 2020, at 12:41 PM, Matthew Knepley <knepley at gmail.com> wrote:
> 
> On Tue, Sep 29, 2020 at 9:21 AM Oliver Zacharias <olz at freenet.de <mailto:olz at freenet.de>> wrote:
> Dear Sir or Madam,
> 
> regarding your SNES-Tool one can specifiy at least three types of
> accuracy which force the code to terminate. I would like know how you
> have defined (and implemented) the following quantities:
> 
> a) "rtol"
> 
> This means a relative tolerance, or bound on ||F(x_n)||/||F(x_0)||
>  
> b) "abstol"
> 
> This mean an absolute tolerance, or a bound on ||F(x_n)||
> 
>   Thanks,
> 
>       Matt
>  
> The definition of the quantity "stol" is already described on one of
> your manual pages. Would you also like to present a cite where to find
> those definitions?
> Thanks in advance,
> Oliver Zacharias
> 
> 
> 
> -- 
> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> -- Norbert Wiener
> 
> https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>

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