> > Is the degree of freedom the normal derivative at a point, or is it the
> > mean value of the normal derivative along the edge, or anything like
> > this? If this was the case, then you would have assigned a multiple of
> > the correct value as boundary values.
>
> The degree of freedom is the whole gradient at a corner.
Then how do you get the values that you pass on to
MatrixTools::apply_boundary_values? Do you use
VectorTools::interpolate_boundary_values or something else?
> > In general, what happens if you have a problem with zero right hand side
> > and nonzero boundary values on a mesh with uniform mesh size? Do you get
> > a solution that is correct up to a multiplicative constant?
>
> The solution is correct in the domain. The values at the boundary
> oscillate.
So it converges in the interior, just not at the boundary?
W.
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Wolfgang Bangerth email: [EMAIL PROTECTED]
www: http://www.math.tamu.edu/~bangerth/
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