特征库 - >用来自文件或现有std :: vector< string>的数据初始化矩阵。内容

问题描述

我的问题是如何初始化特征矩阵，但不：

     = vector.back（）这不工作。
解决方案
它不快或有效，但它的工作原理：
  #includetopo.h
 #include< iostream> 
 #include< fstream> 
 #include< vector> 
 #include< Eigen / Dense> 
 #include< Eigen / Sparse> 
 #include  #include< algorithm> 
 
 
使用namespace std; 
 using namespace Eigen; 
 
 / **从File读取数据并将其作为字符串存储在向量中** / 
 int readFromFile（const char * path，vector< string>& mv）// muss vector vorher调整大小werden？ wan ja lese zeilenanzahl 
 {
 fstream file; 
 string line; 
 file.open（path）; 
 
 while（getline（file，line））// lese zeilefürzeile 
 {
 mv.push_back（line）; //füllevector von hinten last in first 
} 
 file.close（）; 
 return 0; 
} 
 
 
 typedef Matrix< int，4，4> MyMatrix; // Matrixspäterdynamisch 
 
 / **解析要用作特征矩阵的数据** / 
 int fromVectoEigen（vector< string& source，MyMatrix& target）
 {/ **将字符串转换为int并将其写入二维数组** / 
 int array [4] [4]; // noch resize nach vectorsize  - > matrizen sind quadratisch 
 int i = source.size（）; 
 for（i = i-1; i> = 0; i--）// da nur von hintern auf vector zugreifbar auch von hinten bei array anfangen 
 {
 string myString = source 。背部（）; // leztzes Element von Vector als String 
 stringstream ssin（myString）; 
 int j = 0; 
 while（ssin.good（）&& j< 4）// auch hier vectorsizespäterdynamisch 
 {
 ssin> array [j] [i]; //füllespalten in i.ter zeile 
 ++ j; 
} 
 
 
 source.pop_back（）; // array.Leztes元素
 
} 
 // cout '; 
 // cout<< array [0] [1]<< array [1] [1] <<'\\\
'; 
 // cout<< array [0] [2]<< array [1] [2] <<'\\\
'; 
 // cout<< array [0] [3]<< array [1] [3] <<'\\\
'; 
 // 
 / **从二维数组到一维数组** / 
 int newarray [16]; // vectorsize * vectorsize 
 int k = 0; 
 for（int i = 0; i  {for（int j = 0; j< 4; j ++）// vectorsize 
 {
 newarray [k] = array [j] [i]; 
 k ++; 
} 
 
} 
 / **从数组创建Eigen矩阵** / 
 target = Map< Matrix4i>（newarray）; 
 target.transposeInPlace（）; 
 cout<< target<<'\\\
'; 
 
 
 
 return 0; 
} 
  
 
My question is how to initialize an eigen Matrix, but NOT this way:
matrix << 1,0,1,0,
          1,0,1,0,
          1,0,1,0,
I have a Matrix that looks like the above one ( commas or no commas doesnt matter)stored in a txt file.
I already wrote a function to read in each line and put it into a vectornow I want to create a matrix with this data
But it doesn' work and I cant find any page that explains how to assign data to a matrix without writing just the values.(like the example above)
All I need is the data from my file in an eigen Matrix 
What I tried so far: (PS: had the idea with the iterators but i guess it will take too long with really big matrices, I just tried this example with a 1-2 dimensional matrix) 
int readFromFile (const char * path, vector <string> & mv)
{
    fstream file;
    string line;
    file.open(path);

    while (getline(file,line))
    {
        mv.push_back(line);
    }
    file.close();
    return 0;
}


typedef Matrix <int, 1, 2> MyMatrix;

int fromVectoEigen (vector<string> & source, MyMatrix & target)
{   //for (int i = source.size(); i<0 ; i--)
    //{

        string valuerow = source.back();
        string::iterator it = valuerow.begin();
        target.row(0)<< *it;
        target.row(0)<<*it+1;
        //source.pop_back();
    //}

    return 0;
}
Unfortunately cant just say Matrix.row(i) = vector.back() that doesnt work.
 解决方案 
I think I found a solution! Its not fast or efficient but it works:
#include "topo.h"
#include <iostream>
#include <fstream>
#include <vector>
#include <Eigen/Dense>
#include <Eigen/Sparse>
#include <iterator>
#include <algorithm>


using namespace std;
using namespace Eigen;

/**Read data from File and store it in vector as string**/
int readFromFile (const char * path, vector <string> & mv) // muss vector vorher resized werden? wenn ja lese zeilenanzahl
{
    fstream file;
    string line;
    file.open(path);

    while (getline(file,line)) // lese zeile für zeile
    {
        mv.push_back(line); //fülle vector von hinten last in first
    }
    file.close();
    return 0;
}


typedef Matrix <int, 4, 4> MyMatrix; // Matrix später dynamisch

/**Parsing data to be used as Eigen Matrix**/
int fromVectoEigen (vector<string> & source, MyMatrix & target)
{   /**convert string to int and write it to the two dimensional array **/
    int array [4][4]; // noch resize nach vectorsize -->matrizen sind quadratisch
    int i = source.size();
    for ( i= i-1 ; i >= 0 ; i-- ) // da nur von hintern auf vector zugreifbar auch von hinten bei array anfangen
    {
        string myString = source.back(); // leztzes Element von Vector als String
        stringstream ssin(myString);
        int j = 0;
        while (ssin.good() && j < 4) // auch hier vectorsize später dynamisch
            {
            ssin >> array[j][i]; // fülle spalten in i.ter zeile
            ++j;
            }


        source.pop_back(); //lösche letztes element

    }
//        cout<<array[0][0]<<array[1][0]<<array[2][0]<<array[3][0]<<'\n';
//        cout<<array[0][1]<<array[1][1]<<array[2][1]<<array[3][1]<<'\n';
//        cout<<array[0][2]<<array[1][2]<<array[2][2]<<array[3][2]<<'\n';
//        cout<<array[0][3]<<array[1][3]<<array[2][3]<<array[3][3]<<'\n';
//
    /** from 2 dimensional array to one dimensional array**/
    int newarray [16]; // vectorsize * vectorsize
    int k = 0;
    for ( int i = 0 ; i< 4 ; i++) // vectorsize
    {   for (int j = 0 ; j<4; j++) // vectorsize
            {
                newarray[k]=array[j][i];
                k++;
            }

    }
    /**create Eigen Matrix from Array**/
    target= Map<Matrix4i>(newarray);
    target.transposeInPlace();
    cout<<target<<'\n';



return 0 ;
}
                        
这篇关于特征库 - &gt;用来自文件或现有std :: vector&lt; string&gt;的数据初始化矩阵。内容的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！