我正在尝试从我的主管调试此代码,而我是C ++的新手。
我发现了几个类似的 no matching function for call to
问题,这些问题使我知道了可能是什么问题,但无法解决。
我已在错误消息和相关功能下方列出了我的想法。
错误消息:
In function ‘int main(int, char**)’:
distanceMatrixToSageGraph.c:104:43: error: no matching function for call to
‘std::vector<std::vector<int>>::push_back(std::vector<std::__cxx11::basic_string<char> >&)’
the_entries.push_back( row_as_vector );
相关功能:
int main(int argc, char** threshold_and_distanceMatrixfilename)
{
if (argc < 2 || argc > 2)
{
std::cerr << "Usage: ./distanceMatrixToSageGraph.o <threshold>
<distanceMatrix_file_calculated_fromDGEsingleCell_data>" << std::endl;
return -1;
}
string distanceMatrixfilename = threshold_and_distanceMatrixfilename[2];
int threshold = std::stoi(threshold_and_distanceMatrixfilename[1]);
std::ifstream distanceMatrixFile(distanceMatrixfilename);
if (!distanceMatrixFile)
{
std::cerr << "Error opening distanceMatrix file: " << distanceMatrixfilename << std::endl;
return -1;
}
string row;
std::getline(distanceMatrixFile, row); // discard the first row, which specifies the format of the file.
vector<vector<int>> the_entries;
while (std::getline(distanceMatrixFile, row))
{
std::stringstream row_as_stringstream(row);
int i; i = 0;
vector<string> row_as_vector;
while (row_as_stringstream.good())
{
string substr;
getline(row_as_stringstream, substr, ',');
row_as_vector.push_back(substr);
};
the_entries.push_back(row_as_vector); //LINE 104
};
}
想法:
std::vector<std::vector<int>>::push_back(std::vector<std::__cxx11::basic_string<char>>&)
std::vector<std::vector<int>>
是一个矩阵,
push_back
在向量的末尾添加了一个元素。the_entries.push-back(row_as_vector)
。原始代码将csv
文件作为输入,其中包含integers
和strings
。现在,我们正在读取一个txt
文件,其形状为:
TEXT
0; INT; INT; INT; INT; ...
0; INT; INT; INT; INT; ...
18 more lines of the above numbers and semicolons
在上面,我们删除了89
行中的第一行。
是否可能需要对代码进行更多的更改才能
读了这个txt
文件而不是csv
文件?
其他错误消息:
In file included from /usr/include/c++/6/vector:64:0,
from distanceMatrixToSageGraph.c:13:
/usr/include/c++/6/bits/stl_vector.h:914:7: note: candidate: void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = std::vector<int>; _Alloc = std::allocator<std::vector<int> >; std::vector<_Tp, _Alloc>::value_type = std::vector<int>]
push_back(const value_type& __x)
^~~~~~~~~
/usr/include/c++/6/bits/stl_vector.h:914:7: note: no known conversion for argument 1 from ‘std::vector<std::__cxx11::basic_string<char> >’ to ‘const value_type& {aka const std::vector<int>&}’
/usr/include/c++/6/bits/stl_vector.h:932:7: note: candidate: void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = std::vector<int>; _Alloc = std::allocator<std::vector<int> >; std::vector<_Tp, _Alloc>::value_type = std::vector<int>]
push_back(value_type&& __x)
^~~~~~~~~
/usr/include/c++/6/bits/stl_vector.h:932:7: note: no known conversion for argument 1 from ‘std::vector<std::__cxx11::basic_string<char> >’ to ‘std::vector<std::vector<int> >::value_type&& {aka std::vector<int>&&}’
完整代码:
// Convert distanceMatrix tables of protein interactions to SAGE graph.
///////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <fstream>
#include <sstream>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <list>
#include <vector>
#include <tuple>
#include <algorithm>
using namespace std;
void writeGraphInSageFormat(string name, std::vector<std::vector<int>> TheEdges)
{
//////////////////////////////////////////////////////////////////////////////////////
// Write out the edges in SAGE format.
///////////////////////////////////////////////////////////////////////////////////////
int edgeNumber = TheEdges.size();
ofstream d1sageFile(name, ios::out);
d1sageFile << "g = Graph([" << endl;
for (int n = 0; n < edgeNumber; n++) {
d1sageFile << "(" << TheEdges[n][0] + 1 << "," << TheEdges[n][1] + 1 << ")," << endl;
}
d1sageFile << "])" << endl;
d1sageFile << "g.show()" << endl;
d1sageFile.close();
std::cout << "SAGE graph written into the file " << name << std::endl;
}
std::vector<std::vector<int>> ConvertEntriesMatrixToEdges(vector<vector<int>> the_entries, int threshold)
{
////////////////////////////////////////////////////////////////////////////////////////////
// Construct the edge-vertex incidence matrix (d_1) from the distanceMatrix entries matrix:
////////////////////////////////////////////////////////////////////////////////////////////
std::vector<std::string> proteinNames;
std::vector<std::vector<int>> TheEdges;
std::cout << "Registering only edges shorter than " << threshold << "." << std::endl;
int thisDistance;
for (int i = 0; i < the_entries.size(); i++)
{
for (int j = i + 1; j < the_entries.size(); j++)
{
// we could use the_entries.size() instead of the_entries.at(i).size(), because this is a square matrix.
thisDistance = the_entries.at(i).at(j);
if (thisDistance < threshold)
{
std::vector<int> CurrentEdge(2);
CurrentEdge[0] = i;
CurrentEdge[1] = j;
TheEdges.push_back(CurrentEdge);
};
};
};
return TheEdges;
}
///////////////////////////////////////////
// Main Program: Extract edges from a distanceMatrix file.
///////////////////////////////////////////
int main(int argc, char** threshold_and_distanceMatrixfilename)
{
if (argc < 2 || argc > 2)
{
std::cerr << "Usage: ./distanceMatrixToSageGraph.o <threshold> <distanceMatrix_file_calculated_fromDGEsingleCell_data>" << std::endl;
return -1;
}
string distanceMatrixfilename = threshold_and_distanceMatrixfilename[2];
int threshold = std::stoi(threshold_and_distanceMatrixfilename[1]);
std::ifstream distanceMatrixFile(distanceMatrixfilename);
if (!distanceMatrixFile) {
std::cerr << "Error opening distanceMatrix file: " << distanceMatrixfilename << std::endl;
return -1;
}
string row; //LINE 88
std::getline(distanceMatrixFile, row); // discard the first row, which specifies the format of the file.
vector<vector<int>> the_entries;
while (std::getline(distanceMatrixFile, row))
{
std::stringstream row_as_stringstream(row);
int i; i = 0;
vector<string> row_as_vector;
while (row_as_stringstream.good())
{
string substr;
getline(row_as_stringstream, substr, ',');
row_as_vector.push_back(substr);
};
the_entries.push_back(row_as_vector); //LINE 104
};
////////////////////////////////////////////////////////////
// Now we assemble the entries to an edges matrix, and write it into a Sage file:
////////////////////////////////////////////////////////////
std::vector<std::vector<int>> TheEdges = ConvertEntriesMatrixToEdges(the_entries, threshold);
char outputFilename[60]; strcpy(outputFilename, distanceMatrixfilename.c_str()); strcat(outputFilename, "AtThreshold"); string thrshld = std::to_string(threshold); strcat(outputFilename, thrshld.c_str()); strcat(outputFilename, ".txt");
writeGraphInSageFormat(outputFilename, TheEdges);
return 0;
}
答案 0 :(得分:4)
我怀疑我们正在尝试输入错误的类型 the_entries.push-back(row_as_vector)
error: no matching function for call to
‘std::vector<std::vector<int>>::push_back(std::vector<std::__cxx11::basic_string<char> >&)’
the_entries.push_back( row_as_vector );
是,您对此有权。错误消息表明您正在尝试将字符串的向量推回整数向量的向量。它们是完全不同的类型,因此不可能。
您可能想要将the_entries
的类型更改为
std::vector<std::vector<std::string>> the_entries;
// ^^^^^^^^^^^^
或
使用std::stoi
将字符串转换为整数,同时推回std::vector<int> row_as_vector
。
std::vector<int> row_as_vector;
while(row_as_stringstream.good())
{
// ......
row_as_vector.push_back(std::stoi(substr));
// ^^^^^^^^^^^^^^^^^^^
};
the_entries.push_back( row_as_vector );
是否可能需要对代码进行更多更改才能读取 这个
txt
文件而不是csv
文件?
如果这两个内容相同,则无需在代码中做太多改变。但是,在调用;
之前,std::stoi
应该是parsed out。因为它可能通过 invalid_argument 错误参数的异常。
一些建议:
using namespace std;
一起练习。看到这个帖子
更多:
Why is "using namespace std;" considered bad practice? std::string
时,
std::vector
..等等),请考虑这种情况,如果
参数是否为只读。是否应修改数据
pass-by-ref ,如果为只读(函数内部不应进行任何修改),则通过 const-ref 传递它们。阅读更多:
How to pass objects to functions in C++?