Currently, the differential operator is implemented as a simple expression with no other information. It must be implemented as a concrete unary expression working on an operand. The operand must be an n-dimensional vector, i.e., a property of a particle or mesh.
Currently, the differential operator is implemented as a simple expression with no other information. It must be implemented as a concrete unary expression working on an operand. The operand must be an n-dimensional vector, i.e., a property of a particle or mesh.