[pooma-dev] FieldStencils and Field(Range) views

[James Crotinger]

Jeffrey might be able to help with this - he worked on some restriction type
of operators for Fields. 

	Jim

> -----Original Message-----
> From: Nils H. Busch [mailto:nilsb at cns.mpg.de] 
> Sent: Friday, June 21, 2002 10:44 AM
> To: pooma-dev
> Subject: Re: [pooma-dev] FieldStencils and Field(Range) views
> 
> 
> James Crotinger wrote:
> 
> >
> >
> > There is, in general, no good way to construct metric 
> information for 
> > a range view of a field, which is why range views evaluate 
> to Fields 
> > with NoGeometry. For instance, if you have a non-uniform 
> > non-orthogonal coordinate system and you remove every other 
> point in 
> > one direction, the new mesh is no longer a simple sub-mesh 
> of the old 
> > mesh, and there is no general way for Pooma to calculate this new 
> > information. For fields with cartesian coordinates this 
> could be done, 
> > but such discrimination would have required the coordinate 
> system type 
> > to be a compile time quantity, and in the re-design of 
> Fields our main 
> > customers really wanted us to reduce the number of template 
> > dependencies (helps code-bloat, compile time, . . .).
> >
> >         Jim
> >
> 
> Thanks for pointing this out.
> 
> How do I then proceed to write something like
> 
> lhs = Function(restriction(rhs(R)));
> 
> where lhs is a coarse resolution field, rhs a finer 
> resolution field, R some range and restriction a function 
> that performs some restriction operation from fine to coarse, 
> so that the right hand side of the assignment is transformed 
> into a POOMA expression tree ( with as few temporary fields 
> as possible) ?
> 
> Any suggestions appreciated.
> 
> 
> --
>     Nils H. Busch
>     Max-Planck-Institute of Cognitive Neuroscience
>     phone:  ++49 (341) 9940-035 fax:  ++49 (341) 9940-204
>     e-mail: nilsb at cns.mpg.de
> 
> 
> 
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