On 12/27/20 8:48 PM, Marc Fehling wrote:
2) I did not know you were trying to interpolate a FENothing element into a
FEQ element. This should not be possible, as you can not interpolate
information from simply 'nothing', and some assertion should be triggered
while trying to do so. The other way round should be possible, i.e.,
interpolation from FEQ to FENothing, since you will simply 'forget' what has
been on the old cell.
In hindsight, FE_Nothing was maybe a poorly named class. It should really have
been FE_Zero: A finite element space that contains only a single function --
the zero function. Because it only contains one function, it requires no
degrees of freedom.
So interpolation from FE_Nothing to FE_Q is well defined if you take this
point of view, and projection from any finite element space to FE_Nothing is also.
Best
Wolfgang
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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