Modified Array Class tutorial, added examples

doc/examples/Tutorial_ArrayClass_interop_matrix.cpp

@@ -0,0 +1,41 @@
+#include <Eigen/Dense>
+#include <iostream>
+
+using namespace Eigen;
+using namespace std;
+
+int main()
+{
+  MatrixXf m(2,2);
+  MatrixXf n(2,2);
+  
+  MatrixXf result(2,2);
+
+  //initialize matrices
+  m << 1,2,
+       3,4;
+
+  n << 5,6,
+       7,8;
+
+  
+  // --> matrix multiplication
+  result = m * n;
+
+  cout << "-- Matrix m*n: --" << endl
+    << result << endl << endl;
+
+
+  // --> coeff-wise multiplication
+  result = m.array() * n.array();
+  
+  cout << "-- Array m*n: --" << endl
+    << result << endl << endl;
+  
+  
+  // ->> coeff-wise addition of a scalar
+  result = m.array() + 4;
+  
+  cout << "-- Array m + 4: --" << endl
+    << result << endl << endl;
+}