Parsing expressions into functions

[kristoffer.carlsson]

@JesseSantoso

Ultimately I either need to be able to parse some arbitrary array of functions which are as performant as the comprehension described in jerryling315’s response, or I need to be able to do the equivalent of eval(Meta.parse("expression")) in a local function scope.

Why can’t you hit global scope in between the eval and calling of the ODE solver?

str = "x[1]*x[2]^2" # read from file
@eval f(x) = $(Meta.parse(str)) # define the function

# pass `f` to some routine

Otherwise, you can do as you do, but need to use invokelatest.

@JesseSantoso

I tried a typed array by using convert(Array{typeof(functions[1]),1},functions) , but I didn’t see any performance difference.

Each function has a different type so this won’t help. You need to use FunctionWrappers.jl for that usecase.