Oh, I see.
Thank you very much for your kind reply.
Kyusik.
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Hi
You are finding maximum at the quadrature points of QGauss(2).
When solution is saved, it is evaluated at uniformly distributed points by
build_patches.
So the two values may differ.
To get same values as in your visualization, you can use a QTrapez and
QIterated. This combination is explain
