Sorry if my message wasn't clear - I am using projection. However I am using
>quadratic elements, and I think that some inbuilt interpolation in
this function
>is producing the funny values. I hope that makes sense?
There's no interpolation going on. It's a projection.
In general, projecting a discontinuous element onto a continuous space
necessarily leads to Gibbs phenomenon, i.e. your projection will have
oscillations close to the discontinuity. Since all you say is that the
solution looks "funny" there's no way for us to say whether that's the
case or not.
> I can send a picture if it makes it clearer?
Yes, please.
Best
W.
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