Automatic differentiation for higher-order derivatives

General Usage
9

Inspired by you, I wrote a code:

    if auto_diff
        _funcs = Function[x_cmd_func]
        for i in 1:d+1
            push!(_funcs, (t) -> ForwardDiff.derivative(_funcs[i], t))
        end
    end
    funcs(t) = [_func(t) for _func in _funcs]