[petsc-users] RK substeps

[Juha Jäykkä]

> There is not an API. The TSRK implementation will be updated to accept a
> user-provided table of coefficients like TSARKIMEX and TSROSW, but you
> shouldn't need to access the coefficients except to view them, right?

Right. I just may need them for my boundary conditions: they depend on time 
derivatives, i.e. change in value of something between time steps. It may be 
necessary to compute those values separately for each substep, but I am not 
sure yet. I am just making sure I have easy access to them - from your answer 
it looks like I need to hard code them.

-Juha