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third_party/eigen/doc/examples/TutorialLinAlgInverseDeterminant.cpp

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+#include <iostream>
+#include <Eigen/Dense>
+
+int main() {
+  Eigen::Matrix3f A;
+  A << 1, 2, 1, 2, 1, 0, -1, 1, 2;
+  std::cout << "Here is the matrix A:\n" << A << std::endl;
+  std::cout << "The determinant of A is " << A.determinant() << std::endl;
+  std::cout << "The inverse of A is:\n" << A.inverse() << std::endl;
+}