c++ - 调用函数时出现段错误

Question

调用 Update_Multiplier 和 gdb 调试器时的段错误显示这些:

Program received signal SIGSEGV, Segmentation fault. 0x080b74e8 in Update_Multiplier() ()

double upperbound = 116325;
double objective = 1.1707e+07;
int main()
{
    Update_Multiplier();
}
void Update_Multiplier()
{
    cout << "function 0" << endl;
    // Determine subgradient vectors
    double gra[1000][1000];
    double grb[1000][1000];
    double dumX = 0;
    double stepsize[1000][1000];
    double tuning=2;
    double LRADum[1000][1000];
    double LRBDum[1000][1000];

    cout << "function 1" << endl;
    // update subgradient vectors
    for (int i=1; i<=noOfNodes; i++)
    {
        for (int j=1; j<=noOfNodes; j++)
        {
            if (C[i][j] != 0)
            {
                dumX=0;
                for (int p=1; p<=noOfCommodity; p++)
                {
                    dumX += X[i][j][p];
                }
                gra[i][j]=dumX-U[i][j]*Y[i][j]-Q[i][j];
                grb[i][j]=Q[i][j]-B[i][j]*Y[i][j];
            }
        }
    }

    // update stepsize
    cout << "function 2" << endl;
    for (int i=1; i<=noOfNodes; i++)
    {
        for (int j=1; j<=noOfNodes; j++)
        {
            if (C[i][j] != 0)
            {
                stepsize[i][j]=(tuning*(UpperBound-Objective))/sqrt((gra[i][j]*gra[i][j])*(grb[i][j]*grb[i][j]));
                LRADum[i][j]=LRA[i][j]+stepsize[i][j]*gra[i][j];
                LRA[i][j]=LRADum[i][j];
                LRBDum[i][j]=LRB[i][j]+stepsize[i][j]*grb[i][j];
                LRB[i][j]=LRBDum[i][j];

            }
        }
    }

}

Answer 1

我在您的代码中看到两个可疑的地方。

首先，您占用了过多的堆栈空间(大约 40 MB)。
其次，您将数组的索引从 1 开始，它应该是 0:

for (int i=1; i<=noOfNodes; i++)

将其更改为:

for (int i=0; i<noOfNodes; i++)