using f_data

[porterjamesj]

Does the interface here provide a way to use the void *f_data argument to an objective function? I have an objective function that needs some other data besides the parameters.

[mlubin]

I believe the idiomatic way is to wrap the objective function in a closure, e.g. x->f(x,data) and pass that to NLopt.

[porterjamesj]

Yeah that's what I figured, Unfortunately anonymous Julia functions are currently very slow (I believe due to poor type specialization). Hopefully this will get better in the future.

[porterjamesj]

Performance issues aside though, currying does make for an elegant interface.

[stevengj]

Yes, the void* stuff is just a hack for languages lacking lexical scoping and nested functions.

[stevengj]

anonymous Julia functions are currently very slow

(For people coming late to this issue, note that this is no longer true as of Julia 0.5.)