如何在for循环中创建具有不同名称的向量 [英] How do you create vectors with different names in a for loop

问题描述

我正在尝试在c ++中创建一堆向量，每个向量都有不同的名称.我在这个站点上四处张望，却没有找到任何简单"的信息，因为我对C ++还是很陌生.我想做到这一点而无需导入以前从未使用过的库.例如:

I'm trying to create a bunch of vectors in c++, each having a different name. I've looked around on this site, and have not found any information that is 'simple', as I'm very new to c++. I would like to do it without importing libraries i've never used before. For example:

#include <iostream>
#include <cmath>
#include <stdlib.h>
#include <vector>
using namespace std;

int main(int argc, char* argv[])
{
    int n = 2;
    int m = 4;
    double size = pow(m,n);
    for (int i=0; i<n; ++i)
        {
             vector<double> xi(size);
             // where xi would vary with the iteration through n
             // i.e. I would have vectors x1, x2 in the case of n=2
        }
return 0;
}

这不是简单的情况，因为我可以在开始时自己创建x1和x2，因为我不知道'n'是什么，因为它将在用户开始时输入.程序.最简单的方法是什么?

This isn't the simple case were I could create x1, and x2 by themselves at the start, because I won't know what 'n' will be, as it will be inputted by the user at the start of the program. What would be the easiest way of doing this?

推荐答案

使用向量向量.

std::vector<std::vector<double>> xArray;
for (int i=0; i<n; ++i)
{
   vector<double> xi(size);

   // Fill up xi
   // ...

   xArray.push_back(xi);    
}

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