ADD: added other eigen lib

libs/eigen/doc/examples/class_CwiseUnaryOp.cpp

@@ -1,7 +1,5 @@
 #include <Eigen/Core>
 #include <iostream>
-using namespace Eigen;
-using namespace std;
 
 // define a custom template unary functor
 template<typename Scalar>
@@ -13,7 +11,7 @@ struct CwiseClampOp {
 
 int main(int, char**)
 {
-  Matrix4d m1 = Matrix4d::Random();
-  cout << m1 << endl << "becomes: " << endl << m1.unaryExpr(CwiseClampOp<double>(-0.5,0.5)) << endl;
+  Eigen::Matrix4d m1 = Eigen::Matrix4d::Random();
+  std::cout << m1 << std::endl << "becomes: " << std::endl << m1.unaryExpr(CwiseClampOp<double>(-0.5,0.5)) << std::endl;
   return 0;
 }