On Tue, Sep 29, 2009 at 11:05:55PM +0100, Garth N. Wells wrote: > > > Anders Logg wrote: > > On Tue, Sep 29, 2009 at 08:55:03PM +0100, Garth N. Wells wrote: > >> I'm looking forward to seeing the new code. Is all the old functionality > >> still in place? > > > > Yes and no. Everything except the generated CoefficientSet stuff > > should still work in the C++ interface, but the Python interface won't > > work until the corresponding changes have been made on the Python side. > > > > Here's some more information about the changes: > > > > 1. Subclassing Function and overloading eval() has been replaced by > > the Expression subclass which works in the same way with eval(). > > > > 2. All the old functionality/logic of the Function class is still in > > place but it can now be cleaned up and simplified. > > > > 3. A Function will now *always* have a FunctionSpace and *always* have > > a vector. > > > > 4. An Expression *never* has a FunctionSpace and *never* has a vector. > > > > 5. FunctionSpaces are not attached to coefficients when doing a.f = f. > > > > 6. The DOLFIN wrappers have been simplified and now rely on the > > new very simple CoefficientAssigner class. > > > > 7. The assembler works through the common base class Coefficient, in > > particular the restrict() function for restricting to a local element. > > > > 8. Some checks have been removed in Assembler since a Coefficient does > > not (if it is an Expression) have a FunctionSpace so we can't check > > value_rank etc. > > > > Things that need to be done now: > > > > 1. Clean up Function. > > > > Should we have the functions > > void Function::interpolate(const Expression& expression) > const Function& Function::operator= (const Expression& expression) > > to interpolate an expression in a FE space?
Yes, and these should replace the old u.interpolate() function. -- Anders
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