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[Johan Hake <question149919@xxxxxxxxxxxxxxxxxxxxx>]

Question #149919 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/149919

Johan Hake proposed the following answer:
On Tuesday March 22 2011 08:40:42 Christian Clason wrote:
> Question #149919 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/149919
> 
> Christian Clason posted a new comment:
> Johan,
> 
> thank you for the explanation. That means I should call the
> PETScKrylovSolver with
> 
> y_petsc = PETScVector(V.dim()); y_petsc[:] = y.vector()[:]
> x_petsc = PETScVector(V.dim())

Sure or just:

  y_petsc = down_cast(y.vector())

Johan

> NewtonSolver = PETScKrylovSolver('cg', 'none')
> NewtonSolver.solve(H, x_petsc, y_petsc)
> 
> right? (I'm trying to get a correct minimal example for the bug report.)
> 
> Christian

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