Thanks for these encouraging words. I have already written an R package 
with more than a hundred numerical functions (incl. several numerical 
derivatives), and I would be willing to help build up a numerical package 
in Julia. But of course, someone from the Julia community will be needed to 
take the lead. Please let me know when this 'management position'(?) has 
been taken.

On Tuesday, January 21, 2014 4:44:37 PM UTC+1, John Myles White wrote:
>
> Just to chime in: the biggest problem with the Calculus isn’t the absence 
> of usable functionality, it’s that the published interface isn’t a very 
> good one and the more reliable interface, including things like 
> finite_difference_hessian, isn’t exported. 
>
> To fix this, we need someone to come in and do some serious design work, 
> where they'll rethink interfaces and remove out-dated functionality. As Tim 
> Holy mentioned, the combination of the unpublished finite diference methods 
> and automatic differentation methods in DualNumbers should get you very 
> far. 
>
>  — John 
>
>

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