Boost C++ Libraries: Ticket #11235: Variance error when used with std::complex https://svn.boost.org/trac10/ticket/11235 <p> The result of variance in complex numbers sequence must be real, but it is complex. </p> <p> It is solved changing the line (in "variance.hpp"): </p> <blockquote> <p> this-&gt;variance = </p> <blockquote> <p> numeric::fdiv(this-&gt;variance * (cnt - 1), cnt) </p> </blockquote> <p> + numeric::fdiv(tmp * tmp, cnt - 1); </p> </blockquote> <p> with this one: </p> <blockquote> <p> this-&gt;variance = </p> <blockquote> <p> numeric::fdiv(this-&gt;variance * (cnt - 1), cnt) </p> </blockquote> <p> + numeric::fdiv(std::pow(std::abs(tmp),2), cnt - 1); </p> </blockquote> <p> P.D: sorry, I don't know how to fix it in "lazy_variance" </p> en-us Boost C++ Libraries /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/11235 Trac 1.4.3