複製boost :: numeric :: ublas ::矩陣行向量的向量

Question

• 我想複製矩陣行向量向量我怎麼能 應用它？
• 是否有可能將提升矩陣轉換爲向量向量？

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源代碼：

#include <iostream.h> 
#include <boost/numeric/ublas/matrix.hpp> 
#include <vector> 

int main() 
{ 
    //declare vector and matrix 
    std::vector<std::vector<float>> document; 
    boost::numeric::ublas::matrix<float> data(10,10); 
    // fill matrix (any numbers) 
    for (size_t i = 0; i < data.size1(); i++) 
    { 
     for (size_t j = 0; j < data.size2(); j++) 
     { 
      data(i,j) = i + j ; 
     } 
    } 

    //The problem is here. I want to copy data(j) to document i.e document.push_back(data(j)). How can I copy matrix rows to a vector? 
    //I know that it's wrong: document.push_back(data(j)) but that's almost what i am trying to do 

//matrix_row<matrix<double> > mr (m, i); allows me to access a row right? 

return 0; 

} 

Answer 1

您無法分配matrix_row到vector，它需要一些轉換：

for(size_t i = 0; i < data.size1(); ++i) 
{ 
    std::vector<float> row(data.size2()); 
    boost::numeric::ublas::matrix_row<boost::numeric::ublas::matrix<float> > mr (data, i); 

    std::copy(mr.begin(), mr.end(), row.begin()); 
    document.push_back(row); 
}