[petsc-dev] TS Terminology

[Barry Smith]

   You guys are arguing about irrelevancies. Focus on the NAME, that is what Matt is complaining about.


> On Oct 20, 2017, at 11:37 AM, Jed Brown <jed at jedbrown.org> wrote:
> 
> Emil Constantinescu <emconsta at mcs.anl.gov> writes:
> 
>> Matt, that depends, if TS method is imex, 
> 
> Nothing to do with "TS method".  The "imex" parameter is an argument to
> the function TSComputeIFunction.  SNESComputeFunction's behavior depends
> on whether snes->vec_rhs exists, but TSComputeIFunction's behavior
> depends only on the arguments that are passed.
> 
>> then it computes just F, not F-G so your argument is not correct. If
>> the method can do only implicit it computes F and subtracts G *if
>> defined*. If the TS method can only do explicit and you define F then
>> it fails.
>> 
>> Again, this has to do with the TS methods and PETSc doing the work for 
>> you of packing the functions in different ways.
>