Re: [eigen] Map questions

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On Wed, Oct 29, 2008 at 9:01 PM, Cristóvão Sousa <crisjss@xxxxxxxxx> wrote:
> Hi,
> I would like to do something like
>  Vector3d v;
>  // v = something;
>  double a[3];
>  Map<Vector3d>(a) = v;

indeed, "Map<Vector3d>(a) = v;" seems to be equivalent to
"Map<Vector3d> a = v;" that is very unfortunate...

Actually the following variants works:

Map<Vector3d>(a,3) = v;

(Map<Vector3d>(a)) = v;



Map<Vector3d> _a(a);  _a = v;

Map<Vector3d>(a).start<3>() = v;


I could keep going like this forever, but nothing is really good and
intuitive. Perhaps this is a good motivation to resurrect the
Matrix::Map static functions.... ???  or find something else....

> Another thing that could be a little bug:
> it is currently possible to do
>  const double a[3]={1,2,3};
>  Map<Vector3d>(a).setZero();
> , which discards the const qualifier of a.

ok, I'll check later if we can do something for that, but  there is
nothing urgent here.


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