update

2025.09.28_cpp_openblas_test/openblas_test_wtih_eigen.cpp

@@ -0,0 +1,19 @@
+#define EIGEN_USE_BLAS
+#include <iostream>
+#include "Eigen/Dense" // #include <Eigen/Dense>
+
+int main() {
+    Eigen::MatrixXd A(4, 4);
+    A << 2, 1, 1, 0,
+         1, 3, 1, 1,
+         1, 1, 4, 1,
+         0, 1, 1, 5;
+
+    Eigen::MatrixXd A_inv = A.inverse();
+
+    std::cout << "A:\n" << A << std::endl;
+    std::cout << "\nA_inv:\n" << A_inv << std::endl;
+    std::cout << "\nA*A_inv:\n" << A * A_inv << std::endl;
+
+    return 0;
+}