On Mon 2009-04-06 17:24, Kent Andre wrote: > In the matrix action operator, the bc could be enforced after the > action.
Not if you want it to be symmetric. The correct values can be mapped in before "assembly" (i.e. elementwise evaluation of the action) and the rows can be zeroed afterward. You have to take this into account when you decide what to put there during function evaluation. Jed
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