[Dune] Question about the GenericReferenceElements

[Martin Nolte]

Hi Oliver,

when implementing the generic reference element, I implemented all methods of
the original ReferenceElement class. Especially, this included the method

global ( const FieldVector< ctype, dim-codim > &local, int i, int c ) const.

When I saw the redundancy, I simply added another method, dropping the redundant
argument (for convenience).

Back then, I somehow assumed that the interface for the ReferenceElement has
been thoroughly discussed. Over time, this impression has changed. Since the old
ReferenceElement is now gone, I would be very happy to discuss what methods
should be present on the GenericReferenceElement. In particular, I would very
much like to get rid of the (i,c,ii,cc) methods. In my mind it is (c,i,cc,ii)
and, since the types don't differ, I frequently get weird errors from this.

I would very much appreciate, if an "interface" for the reference element could
be discussed on the developer meeting in Münster.

Best,

Martin


On 10/22/2010 02:43 PM, Oliver Sander wrote:
> Dear Dune!
> I just had a look at the GenericReferenceElement class.
> I learned that said class has methods
> 
> template< int codim >
> FieldVector< ctype, dim >
> global( const FieldVector< ctype, dim-codim > &local, int i )
> 
> and
> 
> template< int codim >
> FieldVector< ctype, dim >
> global( const FieldVector< ctype, dim-codim > &local, int i, int c ) const
> 
> Their documentations appear to be identical, with the exception of a
> note saying "The runtime argument c is redundant and must equal codim"
> for the second method.  And indeed the method throws an exception
> if c!=codim.
> 
> 
> Why do we have this seemingly pointless method as part
> of our grid interface?
> 
> Best,
> Oliver
> 
> -- 
> 
> ************************************************************************
> * Oliver Sander                ** email: sander at mi.fu-berlin.de        *
> * Freie Universität Berlin     ** phone: + 49 (30) 838 75348           *
> * Institut für Mathematik      ** URL  : page.mi.fu-berlin.de/~sander  *
> * Arnimallee 6                 ** -------------------------------------*
> * 14195 Berlin, Germany        ** Member of MATHEON (www.matheon.de)   *
> ************************************************************************
> 
> 
> 
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-- 
Martin Nolte <nolte at mathematik.uni-freiburg.de>

Universität Freiburg                                   phone: +49-761-203-5642
Abteilung für angewandte Mathematik                    fax:   +49-761-203-5632
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