docs: public Complex_F64 getEigenvalue(int index ) {
          if( is64 )
              return ((EigenDecomposition_F64)eig).getEigenvalue(index);
          else {
              Complex_F64 c = ((EigenDecomposition_F64)eig).getEigenvalue(index);
              return new Complex_F64(c.real, c.imaginary);
          }
      }