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[Anders Logg <logg@xxxxxxxxx>]

We are currently able to automatically detect the value shape of an
Expression defined like this:

  f = Expression(("x[0]", "sin(x[1])"))

But not if it is defined like this:

  class MyExpression(Expression):
      def eval(self, values, x):
          values[0] = x[0]
          values[1] = sin(x[1])

How should the value shape be specified for a subclass of an
expression?

We had value_rank, value_dim before. We might either require

  def value_shape(self):
      return (2,)

or sending value shape to the constructor:

  f = MyExpression(shape=(2,))

Or there might be some other trick we can do.

--
Anders

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