我使用以下代码在Eigen3中创建了一个稀疏的martrix:
#include <eigen3/Eigen/Sparse>
#include <eigen3/unsupported/Eigen/src/SparseExtra/MarketIO.h>
#include <vector>
using SpMatrix = Eigen::SparseMatrix<double>;
using Eigen::SparseMatrix;
using S = Eigen::Triplet<double>;
using namespace std;
using AdjacenyMatrix = SpMatrix;
int main() {
vector <S> nonzero_compenents;
AdjacenyMatrix am(10, 10);
nonzero_compenents.push_back(move(S(1, 1, 1.0)));
am.setFromTriplets(nonzero_compenents.begin(), nonzero_compenents.end());
bool s = saveMarket(am, "/home/morris/Schreibtisch/sparse_matrices");
return 0;
}
不幸的是,代码无法编译。 MarketIO.h
:
In file included from /home/morris/sparse/main.cpp:2:0:
/usr/include/eigen3/unsupported/Eigen/src/SparseExtra/MarketIO.h: In function ‘void Eigen::internal::PutMatrixElt(Scalar, int, int, std::ofstream&)’:
/usr/include/eigen3/unsupported/Eigen/src/SparseExtra/MarketIO.h:87:9: error: no match for ‘operator<<’ (operand types are ‘std::ofstream {aka std::basic_ofstream<char>}’ and ‘int’)
out << row << " "<< col << " " << value << "\n";
^
... 有什么建议吗?
答案 0 :(得分:0)
正如@ggael所说:不要包含单个文件,而是包含它们的模块/目录。请注意,在这种情况下,您还需要从路径中删除src
。
此前:
#include <eigen3/unsupported/Eigen/src/SparseExtra/MarketIO.h>
现在:
#include <eigen3/unsupported/Eigen/SparseExtra>
完整代码:
#include <eigen3/Eigen/Sparse>
#include <eigen3/unsupported/Eigen/SparseExtra>
#include <vector>
using SpMatrix = Eigen::SparseMatrix<double>;
using Eigen::SparseMatrix;
using S = Eigen::Triplet<double>;
using namespace std;
using AdjacenyMatrix = SpMatrix;
int main() {
vector <S> nonzero_compenents;
AdjacenyMatrix am(10, 10);
nonzero_compenents.push_back(move(S(1, 1, 1.0)));
am.setFromTriplets(nonzero_compenents.begin(), nonzero_compenents.end());
bool s = saveMarket(am, "/home/morris/Schreibtisch/sparse_matrices");
return 0;
}
现在它应该使用例如
进行编译g++ -std=c++11 mycode.cc
答案 1 :(得分:0)
使用
#include <fstream>
#include <Eigen/Sparse>
#include <unsupported/Eigen/SparseExtra>
代替
#include <eigen3/Eigen/Sparse>
#include <eigen3/unsupported/Eigen/src/SparseExtra/MarketIO.h>
代码编译
注意:#include <eigen3/unsupported/Eigen/SparseExtra>
无法编译