Boost prod function

[pm44xl22]

I have a weird problem with the "prod" function of the Boost library. I am trying to multiply a vector with a matrix and get the result vector but I am failing


The code is:

matrix <double> m_matrix1(2,2);
matrix <double> m_matrix2(2,2);
std::vector <double> m_result;



m_result = prod(row(m_matrix1, 1), m_matrix2);

The error is a long log starting with
binary '=' : no operator found which takes a right-hand operand of type 'boost::numeric::ublas::matrix_vector_binary2<E1,E2,F>' (or there is no acceptable conversion)


Can someone help me or link a simple and understandeable guide for the boost library? I already read the official documentation and could not solve

[Lindley]

There's a big difference between a uBLAS vector, which is a mathematical construct, an a std::vector, which is merely a container representing a dynamic array.

[pm44xl22]

I tried using matrix <double>, it did not work either

[pm44xl22]

Bump this topic: I need to solve this problem.


How can I multiply a matrix <double> single row with a complete matrix <double> to obtain an accessible vector of values with uBLAS?


Someone help me please! Links to helping papers are well-accepted since boost mailing list is not helping

[Lindley]

You had the right idea before, but you were trying to use a std::vector where you needed a boost::numeric::ublas::vector.

(Note that row(matrix, i) returns a vector, so the matrix/vector form of prod() will be used which returns a vector.)

[pm44xl22]

Thank you so much Lindley!

Problem solved with your help!!