ffc team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

I think this is already handled. The code generated by FFC is optimized 
so that things that are known to be zero a priori are never computed.

Try the simplest possible example you can think of and look at the 
generated code (the function tabulate_tensor) and see if this is 
correct. (And let us know what you find.)

/Anders


Alessio Quaglino wrote:
> I'm wondering if it's possible to tell FFC that he doesn't have to test
> all the basis functions against each other, but only against themself
> once, so that I get only the diagonal terms of the matrix. I guess this
> would speedup *a lot* the assembly in the case of piecewise elements
> having support on only one tetrahedra, or the case when you need only
> diagonal elements. Am I right or this special case is already handled? Can
> I use a special notation to achieve this aim? Thanks.
>
> Alessio
>
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