| Re: [eigen] questions and remarks to automatic differentiation based on adol-c |
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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] questions and remarks to automatic differentiation based on adol-c
- From: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>
- Date: Mon, 12 Jul 2010 19:47:06 -0400
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Hi,
Sorry for not having replied to your email earlier! Sometimes emails
get lost in the near-constant traffic we get here. Don't hesitate to
ping us much sooner --- no need to wait that long.
It's not clear from your e-mail whether you are talking about 2.0 or
the development branch. The adol-c module is only in the development
branch, but strangely enough, some of your errors below refer to 2.0 !
> A) Using the LU module:
> --------------------------------------------------------------------
> error message:
> <PATH TO EIGEN>/Eigen/src/LU/LU.h:514: error: no matching function for call
> to ‘ei_isMuchSmallerThan(const adtl::adouble&, adtl::adouble&, const
> adtl::adouble&)’
Ah, so here you are talking about Eigen 2.0. In Eigen 2, you have to
specialize all the math functions, including ei_isMuchSmallerThan, for
your scalar type. Since Eigen2 doesn't have any adol-c support you're
on your own :-)
>
>
> B) Using the Choleskey module:
> --------------------------------------------------------------------
> there was missing something, too
2.0 or development branch?
>
>
> C) in AdolcForward:
> --------------------------------------------------------------------
> 1)..................................
> in
> template<> struct NumTraits<adtl::adouble>
> {
> typedef adtl::adouble Real;
> typedef adtl::adouble NonInteger;
> typedef adtl::adouble Nested;
> enum {
> ...... (**)
> };
> };
>
> " HasFloatingPoint = 1" is missing at (**)
HasFloatingPoint has been replaced by IsInteger (which means the opposite).
>
> 2)..................................
> The comment suggests (line 75)
> #include <unsupported/Eigen/AdolcSupport>
> but AdolCSupport does not exist.
Aaaah... it's getting clear now what happened: you've been trying to
use our adolc-support from Eigen3 (development branch) against Eigen2.
Benoit
>
> ______________________________________________________________________________________________________________________________________
>
> --
> Christian Reinl reinl@xxxxxxxxxxxxxxxxxxx
> Simulation, Systems Optimization Phone: +49 (0) 6151-16-5212
> and Robotics Fax: +49 (0) 6151-16-6648
> Technische Universitaet Darmstadt
> Hochschulstr. 10
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>
>
>
>