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/MatrixBase_marked.cpp b/doc/snippets/MatrixBase_marked.cpp
new file mode 100644
index 0000000..f607121
--- /dev/null
+++ b/doc/snippets/MatrixBase_marked.cpp
@@ -0,0 +1,14 @@
+#ifndef _MSC_VER
+ #warning deprecated
+#endif
+/*
+Matrix3d m = Matrix3d::Zero();
+m.part<Eigen::UpperTriangular>().setOnes();
+cout << "Here is the matrix m:" << endl << m << endl;
+Matrix3d n = Matrix3d::Ones();
+n.part<Eigen::LowerTriangular>() *= 2;
+cout << "Here is the matrix n:" << endl << n << endl;
+cout << "And now here is m.inverse()*n, taking advantage of the fact that"
+ " m is upper-triangular:" << endl
+ << m.marked<Eigen::UpperTriangular>().solveTriangular(n);
+*/
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