Modified Array Class tutorial, added examples

doc/examples/Tutorial_ArrayClass_interop_array.cpp

@@ -0,0 +1,34 @@
+#include <Eigen/Dense>
+#include <iostream>
+
+using namespace Eigen;
+using namespace std;
+
+int main()
+{
+  ArrayXXf m(2,2);
+  ArrayXXf n(2,2);
+  
+  ArrayXXf result(2,2);
+
+  //initialize arrays
+  m << 1,2,
+       3,4;
+
+  n << 5,6,
+       7,8;
+
+  
+  // --> array multiplication
+  result = m * n;
+
+  cout << "-- Array m*n: --" << endl
+    << result << endl << endl;
+
+
+  // --> Matrix multiplication
+  result = m.matrix() * n.matrix();
+  
+  cout << "-- Matrix m*n: --" << endl
+    << result << endl << endl;
+}