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[Johan Hake <question127978@xxxxxxxxxxxxxxxxxxxxx>]

Question #127978 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/127978

Johan Hake posted a new comment:
Sorry for the late replay...

In Python you can:

class MyExpr(Expression):
    def __init__(self, func):
        self.func = func
    def eval(self, value, x):
        value[0] = 0.0
        feval = self.func(x)
        if feval>0:
            value[0] = feval

myexpr = MyExpr(func)

You can also make a compiled expression. See the docstring of
Expression, under bullet point 2, for this.

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