[Dune] YaspGrid Entities of higher codim.

[Robert Kloefkorn]

Hello Peter,

 > I think SGrid is so slow because it supports all codimensions for
 > *ANY* dimension and it is on the fly. I don't it is a particularly
 > dump implementation.

First of all, I don't want to offend anybody by claiming that SGrid is 
slow and could be faster. The thing is that I really think SGrid could 
be improved by implementing the IntersectionIterator as a proxy object 
as done for ALUGrid and AlbertaGrid. This would avoid the unnecessary 
copying of (in particular for SGrid) fat objects like the geometry 
objects. The second thing is that for example in the method 
jacobianInverseTransposed the flag builtinverse is set after the 
calculation of the jacobian but it could be used to skip th hole 
calculation. I guess one could find other thing like that we searching 
for such things.

Best regards,

R

-- 

   Robert Klöfkorn           <robertk at mathematik.uni-freiburg.de>

   Mathematisches Institut              Tel: +49 (0) 761 203 5631
   Abt. für Angewandte Mathematik       Fax: +49 (0) 761 203 5632
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