Add examples for API documentation of MatrixBase::cwiseXxx() methods.

doc/snippets/MatrixBase_cwiseAbs.cpp

@@ -0,0 +1,4 @@
+MatrixXd m(2,3);
+m << 2, -4, 6,   
+     -5, 1, 0;
+cout << m.cwiseAbs() << endl;

doc/snippets/MatrixBase_cwiseAbs2.cpp

@@ -0,0 +1,4 @@
+MatrixXd m(2,3);
+m << 2, -4, 6,   
+     -5, 1, 0;
+cout << m.cwiseAbs2() << endl;

doc/snippets/MatrixBase_cwiseEqual.cpp

@@ -0,0 +1,7 @@
+MatrixXi m(2,2);
+m << 1, 0,
+     1, 1;
+cout << "Comparing m with identity matrix:" << endl;
+cout << m.cwiseEqual(MatrixXi::Identity(2,2)) << endl;
+int count = m.cwiseEqual(MatrixXi::Identity(2,2)).count();
+cout << "Number of coefficients that are equal: " << count << endl;

doc/snippets/MatrixBase_cwiseInverse.cpp

@@ -0,0 +1,4 @@
+MatrixXd m(2,3);
+m << 2, 0.5, 1,   
+     3, 0.25, 1;
+cout << m.cwiseInverse() << endl;

doc/snippets/MatrixBase_cwiseMax.cpp

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+Vector3d v(2,3,4), w(4,2,3);
+cout << v.cwiseMax(w) << endl;

doc/snippets/MatrixBase_cwiseMin.cpp

@@ -0,0 +1,2 @@
+Vector3d v(2,3,4), w(4,2,3);
+cout << v.cwiseMin(w) << endl;

doc/snippets/MatrixBase_cwiseNotEqual.cpp

@@ -0,0 +1,7 @@
+MatrixXi m(2,2);
+m << 1, 0,
+     1, 1;
+cout << "Comparing m with identity matrix:" << endl;
+cout << m.cwiseNotEqual(MatrixXi::Identity(2,2)) << endl;
+int count = m.cwiseNotEqual(MatrixXi::Identity(2,2)).count();
+cout << "Number of coefficients that are not equal: " << count << endl;

doc/snippets/MatrixBase_cwiseProduct.cpp

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+Matrix3i a = Matrix3i::Random(), b = Matrix3i::Random();
+Matrix3i c = a.cwiseProduct(b);
+cout << "a:\n" << a << "\nb:\n" << b << "\nc:\n" << c << endl;
+

doc/snippets/MatrixBase_cwiseQuotient.cpp

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+Vector3d v(2,3,4), w(4,2,3);
+cout << v.cwiseQuotient(w) << endl;

doc/snippets/MatrixBase_cwiseSqrt.cpp

@@ -0,0 +1,2 @@
+Vector3d v(1,2,4);
+cout << v.cwiseSqrt() << endl;