Re: [eigen] Mapping dynamic size vectors

[Cedric Doucet <cedric.doucet@xxxxxxxx>]

Hi Matthieu,

I understand what you mean.
As expected, providing a size seems to make the message disappear.

Thank you very much for your help,

Cédric




----- Mail original -----
> De: "Matthieu Brucher" <matthieu.brucher@xxxxxxxxx>
> À: eigen@xxxxxxxxxxxxxxxxxxx
> Envoyé: Mercredi 15 Juillet 2015 16:45:37
> Objet: Re: [eigen] Mapping dynamic size vectors
> 
> Hi,
> 
> I think that's because the default size is then 0, which is supposed
> to be for static sizes!
> 
> Matthieu
> 
> 2015-07-15 15:36 GMT+01:00 Cedric Doucet <cedric.doucet@xxxxxxxx>:
> >
> > Hello!
> >
> > I would like to use a map between a vector type (Matrix<double, Dynamic,
> > 1>)
> > and a pointer (double *).
> >
> > I try to do it like this:
> >     Map< Matrix<double, Dynamic, 1> > my_vector(&my_array[index]);
> > where my_array is of type 'double *', and 'index' is the index where the
> > data I want to map starts.
> >
> > It guess it should not work because I don't provide any information on the
> > size of the array.
> > However, I get another error message which I don't understand:
> >
> > ==================== ERROR MESSAGE ====================
> > eigen3/Eigen/src/Core/util/StaticAssert.h:32:40: erreur: static assertion
> > failed: YOU_CALLED_A_FIXED_SIZE_METHOD_ON_A_DYNAMIC_SIZE_MATRIX_OR_VECTOR
> >      #define EIGEN_STATIC_ASSERT(X,MSG) static_assert(X,#MSG);
> >                                         ^
> > eigen3/Eigen/src/Core/util/StaticAssert.h:134:3: note: in expansion of
> > macro
> > ‘EIGEN_STATIC_ASSERT’
> >    EIGEN_STATIC_ASSERT(TYPE::SizeAtCompileTime!=Eigen::Dynamic, \
> >    ^
> > eigen3/Eigen/src/Core/MapBase.h:128:7: note: in expansion of macro
> > ‘EIGEN_STATIC_ASSERT_FIXED_SIZE’
> >        EIGEN_STATIC_ASSERT_FIXED_SIZE(Derived)
> >        ^
> > ==================== ERROR MESSAGE ====================
> >
> > What does this mean?
> >
> > Cheers,
> >
> > Cédric
> >
> >
> >
> >
> 
> 
> 
> --
> Information System Engineer, Ph.D.
> Blog: http://matt.eifelle.com
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> 
> 
>