Re: [eigen] beta1: geo_alignedbox_8 failing

[Jitse Niesen <jitse@xxxxxxxxxxxxxxxxx>]

On Wed, 30 Jun 2010, Carlos Becker wrote:

> The other error I get is regarding geo_alignedbox_8:
>
> Test alignedboxCastTests(AlignedBox<double,1>()) failed in
> "/home/cjb/eigenThings/eigenBetaTest/eigen/test/geo_alignedbox.cpp" (105)
>     test_ei_isApprox(hp1f.template cast<Scalar>(), b0)
>
> So I believe it is due to the same issues as the previous email regarding
> nullary tests, but I don't know exactly what this is supposed to do.

I had a look at this and I think there was a genuine bug lurking 
underneath, which I now fixed. For the record, the code

  AlignedBox<double,1> interval;
  Matrix<double,1,1> alpha;
  alpha << -1;
  interval.extend(alpha);
  cout << interval.min() << " , " << interval.max() << "\n";

used to print: -1 , 2.22507e-308
but now prints: -1 , -1

The problem was that std::numeric_limits<double>::min() does not return 
the smallest double (approx. -1e300) but the smallest positive normalized 
double (approx. 1e-300).

Cheers,
Jitse