[petsc-users] How to set an initial guess for TS

[Jed Brown]

This sounds like you're talking about a starting procedure for a DAE (or near-singular ODE)?

Fande Kong <fdkong.jd at gmail.com> writes:

> Hi All,
>
> TSSetSolution will set an initial condition for the current TSSolve(). What
> should I do if I want to set an initial guess for the current solution that
> is different from the initial condition?  The initial guess is supposed to
> be really close to the current solution, and then will accelerate my solver.
>
> In other words, TSSetSolution will set "U_{n-1}", and now we call TSSolve
> to figure out "U_{n}". If I know something about "U_{n}", and I want to set
> "\bar{U}_{n}" as the initial guess of "U_{n}" when computing "U_{n}".
>
>
> Thanks,
>
> Fande,