Barry Smith <[email protected]> writes:
>   Hence my suggestion to have TSSetLeftHandSideFunction() (or Jed's 
> suggestion to have multiple Right Hand side functions) this will allow 
> comparison of implicit, explicit, imex without recompiling (which we don't 
> have currently) for the case with no mass matrix. With a mass matrix, unless 
> we use mass lumping and have a TSSetMassMatrix() you cannot switch to full 
> explicit, but that is due to mathematics, not the interface.

Who in reality has a problem that looks like

  u_t = f(u) + g(u) + h(u)

where it may make sense to move some of this to the left (implicit)?
I'm concerned that this isn't natural for many applications so adding an
interface would be solving a problem that doesn't really exist outside
perhaps a few academic examples.

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