Error:指向綁定函數的指針只能用於調用函數

 a1.determinant; 改爲： a1.determinant();   Eigen::MatrixXd a1(2,2);//ImagePoint a1<<n1,p1,n2,p2; double A1=a1.determinant; 改爲： Eigen::MatrixXd a1(2,2);//ImagePoint a1<<n1,p1,n2,p2;

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