我有一个矩阵mtx文件,直到整理出来:

时间:2019-03-08 09:43:19

标签: c++ arrays qt matrix

我有两种代码:

这个,我可以从mtx文件中提取所有字符,但是当我运行它时,我无法获得第一行的最后两个单词,不能跳过带有'%'字符并为空的行行,并且我无法将矩阵维及其值分成各自的数组。另外,第一行带有数字的整数是对维数和条目数进行计数的整数,并且我想创建一个for循环来对主目录进行计数,并在其自己的数组上分离值,以便可以用科学计数法计算它们的frobinius_norm。 >

#include <iostream>
#include <cmath>
#include <vector>
#include <fstream>
#include <string>
#include <iomanip>
#include <sstream>
using namespace std;

void processLine(const string &line)
{
    string first, second, third;
    if ( line[0]&&line[1] == '%' )
    {
        //extract last 2 words
        cout <<line << endl;
    } else if (line[0]=='%')
    {
       //ignore the lines
        cout << line << endl;
    } else {
        /*seperate matrix dimensions and values,
        but the first one is x*y dimension and number of entries*/
        cout << line << endl;
}
}

void processFile(const char *filename)
{
    ifstream inf(filename);
    if ( inf.is_open() ) {
        string line,type;
        while ( getline(inf,line) ) {
       processLine(line);
    }
    } else {
        cout << "Sorry, but the file don't exist!\n";
    }
}

int main(int argc, char *argv[])
{
    if (argc==2){
    cout <<"Filename: " << argv[1] << endl;
        processFile(argv[1]);
} else {
    cout << "give a filename\n";
}
}

这个,我可以成功提取第一个矩阵文件上的所有信息: sparse01.mtx

%% MatrixMarket矩阵坐标模式常规 9 9 50 1 1 2 1 4 1 5 1 6 1 7 1 8 1 9 1 2 2 3 2 ... 9 9

但是sparse02.mtx和sparse03.mtx矩阵无法修改代码以提供正确的结果,因为我无法忽略以'%'开头的行和空行。我无法真正计算主菜和分隔的维度和值,因此我无法计算frobinius范数...

int main(int argc, char *argv[])
{
    string filename, line, type1, type2, header;
    int x, y, entry, count=0;
    double element;
    char norm;
    float frobenius_norm;
    ifstream openfile;

    filename = argv[1];
    openfile.open(argv[1]);

    if(!openfile.is_open())
    {
        cout << "Sorry, but the file don't exist!\n";
        exit(1);
    }

    for(int i =0;i<2;i++)
    {
        getline(openfile,line,' ');
    }

    getline(openfile,header,' ');
    getline(openfile,type1,' ');
    getline(openfile,type2);
    if(getline(openfile,line).peek()=='%'){
        cout << "lol"<<endl;
    }
    openfile >> x >> y >> entry;



    cout <<"Filename: " << filename << endl;
    cout <<"Dimensions: " << x << " x " << y << endl;
    cout <<"Entries: " << entry <<endl;

    if(header == "coordinate")
    {
        cout <<"Sparse: "<< "true" <<endl;
    }
    else if ((x*y/2)<entry||header == "array")
    {
     cout <<"Sparse: "<< "false" <<endl;
    }

    cout <<"Type: "<< type1 << ' ' << type2 <<endl;

    if(type1 == "pattern"){
        norm = '-';
        cout <<"Frobenius norm: "<< norm <<endl;
    } else {
        frobenius_norm = 100;
        cout <<"Frobenius norm: "<< frobenius_norm <<endl;
    }

    return 0;
}

输出应该像这样

文件名:sparse01.mtx 尺寸:9 x 9 参赛作品:50 稀疏:正确 类型:一般模式 Frobenius规范:-

%% MatrixMarket矩阵坐标模式常规 9 9 50 1 1 2 1 4 1 5 1 6 1 7 1 ...(被截断) 9 9

sparse03矩阵的输出是这样的: 档名:sparse03.mtx 尺寸:5 x 5 参赛作品:10 稀疏:正确 类型:实数一般 Frobenius规范:1.2e + 02

这是sparse03.mtx文件(这不是代码,而是输入文件):

%%MatrixMarket matrix coordinate real general
%
% Hello
% How
% Are
% you
% doing
%

5  5  10
1  1  11.0
1  5  15.0  
2  3  23.0  
2  4  24.0  
3  2  32.0    
3  5  35.0   
4  1  41.0  
5  2  52.0
5  4  54.0
5  5  55.0 

我还希望我的代码计算密集且特殊的矩阵:

请记住,我使用argv [1]作为输入参考

0 个答案:

没有答案