ADD: added other eigen lib

libs/eigen/doc/examples/TutorialLinAlgRankRevealing.cpp

@@ -1,20 +1,17 @@
 #include <iostream>
 #include <Eigen/Dense>
 
-using namespace std;
-using namespace Eigen;
-
 int main()
 {
-   Matrix3f A;
+   Eigen::Matrix3f A;
    A << 1, 2, 5,
         2, 1, 4,
         3, 0, 3;
-   cout << "Here is the matrix A:\n" << A << endl;
-   FullPivLU<Matrix3f> lu_decomp(A);
-   cout << "The rank of A is " << lu_decomp.rank() << endl;
-   cout << "Here is a matrix whose columns form a basis of the null-space of A:\n"
-        << lu_decomp.kernel() << endl;
-   cout << "Here is a matrix whose columns form a basis of the column-space of A:\n"
-        << lu_decomp.image(A) << endl; // yes, have to pass the original A
+   std::cout << "Here is the matrix A:\n" << A << std::endl;
+   Eigen::FullPivLU<Eigen::Matrix3f> lu_decomp(A);
+   std::cout << "The rank of A is " << lu_decomp.rank() << std::endl;
+   std::cout << "Here is a matrix whose columns form a basis of the null-space of A:\n"
+        << lu_decomp.kernel() << std::endl;
+   std::cout << "Here is a matrix whose columns form a basis of the column-space of A:\n"
+        << lu_decomp.image(A) << std::endl; // yes, have to pass the original A
 }