diff --git a/doc/snippets/MatrixBase_part.cpp b/doc/snippets/MatrixBase_part.cpp
new file mode 100644
index 0000000..d3e7f48
--- /dev/null
+++ b/doc/snippets/MatrixBase_part.cpp
@@ -0,0 +1,13 @@
+#ifndef _MSC_VER
+  #warning deprecated
+#endif
+/*
+Matrix3d m = Matrix3d::Zero();
+m.part<Eigen::StrictlyUpperTriangular>().setOnes();
+cout << "Here is the matrix m:" << endl << m << endl;
+cout << "And let us now compute m*m.adjoint() in a very optimized way" << endl
+     << "taking advantage of the symmetry." << endl;
+Matrix3d n;
+n.part<Eigen::SelfAdjoint>() = (m*m.adjoint()).lazy();
+cout << "The result is:" << endl << n << endl;
+*/
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