Function exact_expr

python/test/unit/fem/test_expression.py:184–185

(x)

    # implemented within the UFL Expression. This is to check that the
    # Constants are being set up correctly.
    def exact_expr(x):
        return x[0] ** 2 + 2 * x[1] ** 2

    # Unused, but remains for clarity.
    def f(x):