How can I improve performance via a high-level approach when implementing long equations in C++

Question

I am developing some engineering simulations. This involves implementing some long equations such as this equation to calculate stress in a rubber like material:

Answer 1

By any chance, could you supply the calculation symbolically. If there are vector operations, you might really want to investigate using blas or lapack which in some cases can run operations in parallel.

It is conceivable (at the risk of being off-topic?) that you might be able to use python with numpy and/or scipy. To the extent that it was possible, your calculations might be more readable.