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From "Jukka Zitting" <>
Subject Re: [all][nabla] proposition for a new project in sandbox
Date Mon, 14 Apr 2008 09:27:11 GMT

On Sun, Apr 13, 2008 at 11:57 PM, Phil Steitz <> wrote:
> The idea is interesting and I see how it could be useful assuming it
> could be made to work reliably and the
> byte code <-> original function
> differentiated byte code <-> analytical derivative
> mapping could be shown to lift with decent numerics and performance
> for a decent range of original functions.  That is not obvious to me,
> but I have never thought about this kind of thing before.

I share the concern. It doesn't seem obvious that the derivatives of
the byte code operations would produce a computationally accurate
derivative of the source function. Other than that the idea is
interesting, and it would be cool to see how well it works in

Also, the name "nabla" would suggest that the component is designed
for calculating derivatives of vector functions.


Jukka Zitting

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