I have been playing around with DifferentialEquations.jl, mainly for solving reaction diffusion PDE’s. I now wish to add an advection term to my model. For this purpose I discovered DiffEqOperators.jl. UpwindOperator sounds like the class I am looking for. However, I can not figure out what is the directions argument, that should be a BitArray.
@ChrisRackauckas could you enlighten me? 
