Variance error when used with std::complex

[Martín Sanz Sabater <martin.sanz@…>]

The result of variance in complex numbers sequence must be real, but it is complex.

It is solved changing the line (in "variance.hpp"):

this->variance =

numeric::fdiv(this->variance * (cnt - 1), cnt)

+ numeric::fdiv(tmp * tmp, cnt - 1);

with this one:

this->variance =

numeric::fdiv(this->variance * (cnt - 1), cnt)

+ numeric::fdiv(std::pow(std::abs(tmp),2), cnt - 1);

P.D: sorry, I don't know how to fix it in "lazy_variance"