我有一个 Eigen MatrixXd 对象,称为 v,在尝试访问此矩阵内容时遇到一些问题。当我只在控制台打印内容(如代码中所示)时,效果也很好。当我尝试使用该内容时,出现错误:
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);
}
还有我的 ChosenPoint 类:
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;
};
最佳答案
我的错。问题出在我在项目中使用的其他矩阵之一,我花了一段时间才弄清楚。不幸的是,当这种情况发生时,Eigen 似乎并没有真正的帮助:
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.
无论如何,希望这对更多像我一样的人有帮助。
关于c++ - Eigen C++ 断言失败,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38626653/