Code: Select all

#include <Eigen/core>
#include <iostream>
#include <complex>

int main(){
    Eigen::Matrix2cd test;
    test<<0.0 + 1.0j, 2.0 + 3.0j, 4.0 + 5.0j, 6.0 + 7.0j;
    test = test * 1.0j;
    std::cout<<test<<std::endl;
}

outputs a zero matrix in Eigen 3.3, and the correct one in Eigen 3.2. However, using

Code: Select all

#include <Eigen/core>
#include <iostream>
#include <complex>

int main(){
    Eigen::Matrix2cd test;
    test<<0.0 + 1.0j, 2.0 + 3.0j, 4.0 + 5.0j, 6.0 + 7.0j;
    test = test * std::complex<double>(0.0, 1.0);
    std::cout<<test<<std::endl;
}

works fine. Took me a while to hunt this down. Is this a bug or on purpose?

hm, your examples are invalid, j instead of i, and you need to include the std::complex_literals namespace. The following example work fine with either 3.2 or 3.3:

Code: Select all

#include <Eigen/core>
#include <iostream>

using namespace std::complex_literals;

int main(){
    Eigen::Matrix2cd test;
    test<<0.0 + 1.0i, 2.0 + 3.0i, 4.0 + 5.0i, 6.0 + 7.0i;
    std::cout<<test<<std::endl;
    test = test * 1.0i;
    std::cout<<test<<std::endl;
}