Lazy Evaluation of PDE Coefficients in the EScript System

EScript is an extension to Python for solving partial diffierential equations on parallel computers. It is parallelised for both MPI and shared memory, multi-core systems using OpenMP. In this paper, we discuss lazy evaluation as a strategy to reduce the cost of evaluating the coefficients of PDEs prior to solving. We show that our implementation provides signi cant memory and time savings for a problem involving complex expressions