[eigen] Vectorwise dot product feature request

[Johan Pauwels <johan.pauwels@xxxxxxxxxxxxx>]

Hello all,

Would it be possible to allow a vectorwise dot product as in the example 
below?

#include <Eigen/Core>

int main()
{
    Eigen::MatrixXf mat = Eigen::MatrixXf::Random(5,2);
    Eigen::VectorXf vec = Eigen::VectorXf::Random(5);
    Eigen::RowVectorXf result(2);

    // this syntax
    result = mat.colwise().dot(vec);
    // instead of this for loop
    for (int i = 0; i < mat.cols(); ++i)
    {
        result[i] = mat.col(i).dot(vec);
    }
}

Regards,
Johan