Re: [petsc-users] How to manually set the matrix-free differencing parameter h?

Tue, 23 May 2017 11:03:25 -0700 

   That's not really the right function; you can use MatMFFDSetFunctionError(), 
MatMFFDSetType(), MatMFFDSetPeriod() to set the available parameters.


    Barry


> On May 23, 2017, at 12:09 PM, Ping He <[email protected]> wrote:
> 
> Hi,
> 
> I am using PETSc-SNES matrix free approach, and I would like to know how to 
> manually set the differencing parameter h. I tried to use the 
> SNESDefaultMatrixFreeSetParameters2 function but I got an error when 
> compiling: ‘SNESDefaultMatrixFreeSetParameters2’ was not declared in this 
> scope.
> 
> Thanks very much in advance.
> 
> Regards,
> Ping

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