How to initialize a vector array using a function

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3.00/5 (1 vote)

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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

C++

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;
}

Posted 19-Jul-13 8:27am

mars zhang

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Sergey Alexandrovich Kryukov 19-Jul-13 14:52pm

Return what?
—SA

1 solution

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JackDingler · Accepted Answer · 2013-07-19T08:33:00

Solution 1

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.

C++

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;
}

Posted 19-Jul-13 8:33am

JackDingler

Updated 19-Jul-13 8:34am

v3

Comments

Sergey Alexandrovich Kryukov 19-Jul-13 14:53pm

Exactly; 5 ed.
—SA

ridoy 19-Jul-13 15:15pm

+5

mars zhang 19-Jul-13 15:21pm

It works. Thanks a lot for all of you involved.