changing default values in options database

Lisandro Dalcin dalcinl at
Fri Nov 7 12:32:28 CST 2008

On Fri, Nov 7, 2008 at 3:12 PM, Matthew Knepley <knepley at> wrote:
> I think you can just set those values before you call SetFromOptions()
> and they will show up. However, I have not tried it.

Yep, that's the way options work in most cases.

> On Fri, Nov 7, 2008 at 1:06 PM, Boyce Griffith <griffith at> wrote:
>> Hi, Folks --
>> Is there a simple way to change these default values for individual solvers?
>>  In particular, I would like to be able to ensure that the default values
>> listed by `-help' correspond to the values that I'm specifying in the code.

As Matt, suggested, use this

KSPSetTolerances(ksp, ....)

Lisandro Dalcín
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
PTLC - Güemes 3450, (3000) Santa Fe, Argentina
Tel/Fax: +54-(0)342-451.1594

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