> Some problems occur due to the transform_covariant() method. Can someone
> briefly introduce me to the changes that have been made in MappingQ1? For
> example: Why has the DeclException0 (ExcAccessToUninitializedField)
> disappeared? And why do I have to use the update_covariant_transformation
> as a user flag?
Can you be a bit more specific? When were these changes made and what is the
issue with the user flag? For example, copy the code and comment on what part
you don't understand.
> Next problem is the graphical output. I use the method build_patches() in
> DataOut. Is there a problem because I use poynomials of order three and
> three subdivisions in build_patches? How is the interpolation made on the
> "subcells"?
Essentially build_patches just subdivides each cells into NxN subcells and
does a (bi-/tri-)linear interpolation from the mother cell to the children.
Since no output format I'm aware of supports writing higher order polynomials
than linears, this is the only way to get at least some part of the
information from higher order basis functions to the screen.
Cheers
W.
-------------------------------------------------------------------------
Wolfgang Bangerth email: [EMAIL PROTECTED]
www: http://www.math.tamu.edu/~bangerth/
_______________________________________________
