Re: [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 <friede...@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