[eigen] Parameters in Levenberg Marquard algorithm of wrong type?

["Claas H. Köhler" <claas.koehler@xxxxxx>]

Hi!

Has anybody ever tried to use the LevenbergMarquardt class of the 
unsupported NonLinearOptimization module with complex values? I am 
asking, because all parameters specified in the Parameters struct are of 
type Scalar, which would result in std::complex<double> values. However, 
if I am not mistaken, these values should be real quantities, even if 
the underlying problem is complex.

Furthermore comparisons of the form
if (parameters.ftol < 0.) {...}
are used, while operator< should not be defined for complex values at all.

Would it not be preferable to use NumTraits<Scalar>::Real instead for 
the parameters?


Regards
Claas