Eigen C++ Assertion Failed - c++

Question

I have an Eigen MatrixXd object, called v, and I am facing some problems when trying to access this matrix content. When I only print the content at the console (as in the code), works just as fine. When I try to use the content, the error shows up:
Assertion failed: (row >= 0 && row < rows() && col >= 0 && col < cols()), function operator(), file /usr/local/Cellar/eigen/3.2.4/include/eigen3/Eigen/src/Core/DenseCoeffsBase.h, line 337.
ChosenPoint ** points = new ChosenPoint*[width];
for (int i = 0; i < width; i++)
{
points[i] = new ChosenPoint[height];
for (int j = 0; j < height; j++)
{
points[i][j].setPoint(i, j, false);
points[i][j].setNumberOfFrames(numberOfFrames);
}
}
Matrix<double, 2, 1> v = (aT * a).inverse() * aT * b;
if (v.rows() == 2 && v.cols() == 1)
{
points[x][y].setFlow(v(0,0), v(1,0), frame);
}
And my ChosenPoint class:
typedef struct point
{
double x;
double y;
bool isValid;
} point;
class ChosenPoint
{
public:
ChosenPoint()
{
}
~ChosenPoint()
{
}
void setNumberOfFrames(int numberOfFrames)
{
this->flow = new point[numberOfFrames];
for (int i = 0; i < numberOfFrames; i++)
{
point f;
f.x = 0.0;
f.y = 0.0;
this->flow[i] = f;
}
}
void setPoint(int x, int y, bool isValid)
{
this->pt.x = (double) x;
this->pt.y = (double) y;
this->pt.isValid = isValid;
}
point getPoint()
{
return this->pt;
}
point* getFlow()
{
return this->flow;
}
void setFlow(double &xFlow, double &yFlow, int &position)
{
this->flow[position].x = xFlow;
this->flow[position].y = yFlow;
}
void updateFlow(int position)
{
this->flow[position].x = 2*this->flow[position].x;
this->flow[position].y = 2*this->flow[position].y;
}
void updateFlow(double xFlow, double yFlow, int position)
{
this->flow[position].x = xFlow;
this->flow[position].y = yFlow;
}
point pt;
point *flow;
};

Answer 1

My fault. The problem was with one of the other matrixes that I was using in the project, and took me a while to figure it out. Unfortunately, Eigen doesn`t seem to be really helpful when this happens:
I had 2 matrixes (A and B). The matrix with problem was A (somehow, some data was not loaded into the matrix). But when i multiplied A and B, it generated a new matrix C with some valid results (all my sanity checks were unuseful). I admit I don`t know a lot of Eigen.
Anyway, hope this is helpful for more people like me.