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5.2 Aim and utilization limits

The user is offered different possibilities to define the function. the function can be:

• when the time arrives, typed on the keyboard in the form F(X,Y) = expression in X and Y;

• input as a classical Fortran function (declaration via EXTERNAL)

• described using an array of values T(NX,NY) (previously stored on file)

• constructed from the finite element results by interpolation (D.S. NOPO and D.S. B). The interpolation from P1 finite element results is enclosed in the software.