Matrix() [4/16]

Matrix

(

const Matrix< Val2, Alloc2, Derived2_t, Policy2 > &

r

)

Constructs a copy of given matrix transformed from some other instantiation of the Matrix template.

Template Parameters

Val2	is a type of elements of a given matrix which should be explicitly convertible to value_type.
Alloc2	is a type of an allocator of a given matrix which is rebinded to an allocator instance for value_type and then explicitly converted to allocator_type.
Derived2_t	is a type implementing the matrix specified as the argument.
Policy2	is a policy of execution of methods of the matrix specified as the argument. Policy is not considered by the constructor.

Parameters

r	is a given matrix instance of another type. It is converted to the current type with a result (of conversion) to be a constructed matrix.

Example code:

#include <chsvlib/chsvmath.h>
#include <iostream>
 
template <class alloc_t>
double AverageElement(const Chusov::Math::Matrix<double, alloc_t>& m)
{
    double ave = 0.;
    for (auto c:m)
        for (auto r:c)
            ave += r;
    return ave / (m.Rows() * m.Columns());
}
 
int main(int argc, char argv)
{
    Chusov::Math::Matrix<int> m =
        {
            {1, 2, 3},
            {4, 5, 6}
        };
    std::cout << "An average value between matrix elements is " << AverageElement(Chusov::Math::Matrix<double>(m)) << std::endl;
    return 0;
}

Output is

An average value of matrix elements is 3.5.