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

[Ping He]

Hi Barry,

Thanks for your reply. It is working.

Regards,
Ping

On 05/23/2017 02:02 PM, Barry Smith wrote:
>     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 <friedenhe at gmail.com> 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