dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Thu, Sep 25, 2008 at 12:41:33PM +0100, Garth N. Wells wrote:
> Nuno David Lopes wrote:
> > Is there a simple way of setting an initial guess for an Iterative 
> > LinearSolver? 
> > In Umfpack and PETSc the default initial guess is the zero vector right?
> 
> At the moment, yes (note the UMFPACK is an LU solver, so an initial 
> guess doesn't do anything).
> 
> It's very simple, and I've been meaning to add an option for using an 
> initial guess. It's also useful for Newton solvers. I'll add something 
> in the next few days.
> 
> Garth

It would be natural to let the x argument always be the initial
guess. I thought we already did this.

Would it be enough to make sure that Vector::init() does not reset the
values to zero?

-- 
Anders

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