Eigen functions crash in the 2nd round of a for loop

[RezaAb]

Eigen functions crash in the 2nd round of a for loop
I am using some Eigen functions in my code which has a for loop. I have no problem in the first step but I get an error in the second round (j = 1) in the x_eigen.resize(TotalDist); line. Here is the code:

#include "Eigen/Dense"
using namespace Eigen;

void avgTemperature() {
    int TotalDist = 400;
    int TotalTime = 5000;
    vector<vector<double>> A(TotalDist, std::vector<double>(TotalDist));
    vector<double> b_copy, x;
    VectorXd x_eigen;				//Eigen format! 
    MatrixXd A_eigen;
    VectorXd b_eigen;
        
    // ...

    for (int j = 0; j < TotalTime; j++) {

	for (int i = 0; i < (TotalDist - 1); i++) {
	        A[i + 1][i] = 1;
	        A[i][i] = 5;
	        A[i][i + 1] = -1;
	}
        A[TotalDist - 1][TotalDist - 1] = 15;
	b_copy.resize(TotalDist);
	for (int i = 0; i < TotalDist; i++) { b_copy[i] = 15.0; }

        A_eigen.resize(TotalDist, TotalDist);
        for (int i = 0; i < TotalDist; i++) {
		A_eigen.row(i) = Map<VectorXd>(A[i].data(), TotalDist);
	}
	b_eigen.resize(TotalDist);
	for (int i = 0; i < TotalDist; i++) {
	        b_eigen(i) = b_copy[i];
        }
	x_eigen.resize(TotalDist);
	x_eigen = A_eigen.colPivHouseholderQr().solve(b_eigen);

	x.resize(TotalDist);
	for (int i = 0; i < TotalDist; i++) {
	        x[i] = x_eigen(i);
       }
        A_eigen.resize(0, 0);
        b_eigen.resize(0);
        x_eigen.resize(0);
        b_copy.clear();
        
        // ... I am gonna fill the "x_eigen" for each round of the for loop

    } // end of the for loop
} // end of the function 

Although I have used the x_eigen.resize(0); in the code but in the j = 1, I get an error in the code in the following line:

x_eigen.resize(TotalDist);

I am curious of the allocating and/or reallocating the memory dealing with the x_eigen, where I have no such problem in A_eigen and b_eigen.

Appreciate your help! Thanks.