Squashed 'third_party/eigen/' content from commit 61d72f6
Change-Id: Iccc90fa0b55ab44037f018046d2fcffd90d9d025
git-subtree-dir: third_party/eigen
git-subtree-split: 61d72f6383cfa842868c53e30e087b0258177257
diff --git a/doc/snippets/Tutorial_AdvancedInitialization_ThreeWays.cpp b/doc/snippets/Tutorial_AdvancedInitialization_ThreeWays.cpp
new file mode 100644
index 0000000..cb74576
--- /dev/null
+++ b/doc/snippets/Tutorial_AdvancedInitialization_ThreeWays.cpp
@@ -0,0 +1,20 @@
+const int size = 6;
+MatrixXd mat1(size, size);
+mat1.topLeftCorner(size/2, size/2) = MatrixXd::Zero(size/2, size/2);
+mat1.topRightCorner(size/2, size/2) = MatrixXd::Identity(size/2, size/2);
+mat1.bottomLeftCorner(size/2, size/2) = MatrixXd::Identity(size/2, size/2);
+mat1.bottomRightCorner(size/2, size/2) = MatrixXd::Zero(size/2, size/2);
+std::cout << mat1 << std::endl << std::endl;
+
+MatrixXd mat2(size, size);
+mat2.topLeftCorner(size/2, size/2).setZero();
+mat2.topRightCorner(size/2, size/2).setIdentity();
+mat2.bottomLeftCorner(size/2, size/2).setIdentity();
+mat2.bottomRightCorner(size/2, size/2).setZero();
+std::cout << mat2 << std::endl << std::endl;
+
+MatrixXd mat3(size, size);
+mat3 << MatrixXd::Zero(size/2, size/2), MatrixXd::Identity(size/2, size/2),
+ MatrixXd::Identity(size/2, size/2), MatrixXd::Zero(size/2, size/2);
+std::cout << mat3 << std::endl;
+