如何使用函数初始化矢量数组 [英] How to initialize a vector array using a function

问题描述

您好，



我必须使用很多数组，例如vector< vector>< double> > A1，...一个。一个接一个地初始化它们并不是一个好主意，这就是我所做的。我想知道是否有办法使用初始化函数来实现它。附件是我想要使用的，但它不起作用。





谢谢，

Paul

Hello,

I have to use many arrays like vector<vector><double> > A1,...An. It is not really a good idea to initialize them one after one, which is what I did. I was wondering if there is a way using a initializing function to make it. Attached is what I am trying to use, yet it does not work.


Thanks,
Paul

void mtx_initialize( vector<vector< double> > A,int row, int col){
     A.resize(row);
     for(int r=0;r<row;r++)   A[r].resize(col);
     return;
}

推荐答案

假设您的代码已构建并运行，则缺少一件。



您需要传递对向量的引用。你正在制作和丢弃副本。

Assuming your code builds and runs, you have one piece missing.

You need to pass a reference to the vector. As is, you're making and discarding a copy.

void mtx_initialize( vector<vector< double> > & A,int row, int col){
     A.resize(row);
     for(int r=0;r<row;r++)   A[r].resize(col);
     return;
}

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