doc updates/improvements

doc/examples/TutorialLinAlgSVDSolve.cpp

@@ -0,0 +1,15 @@
+#include <iostream>
+#include <Eigen/Dense>
+
+using namespace std;
+using namespace Eigen;
+
+int main()
+{
+   MatrixXf A = MatrixXf::Random(3, 2);
+   cout << "Here is the matrix A:\n" << A << endl;
+   VectorXf b = VectorXf::Random(3);
+   cout << "Here is the right hand side b:\n" << b << endl;
+   JacobiSVD<MatrixXf> svd(A, ComputeThinU | ComputeThinV);
+   cout << "The least-squares solution is:\n" << svd.solve(b) << endl;
+}