Add MatrixBase::cwiseArg()
diff --git a/doc/snippets/MatrixBase_cwiseArg.cpp b/doc/snippets/MatrixBase_cwiseArg.cpp
new file mode 100644
index 0000000..e0857cf
--- /dev/null
+++ b/doc/snippets/MatrixBase_cwiseArg.cpp
@@ -0,0 +1,3 @@
+MatrixXcf v = MatrixXcf::Random(2, 3);
+cout << v << endl << endl;
+cout << v.cwiseArg() << endl;
\ No newline at end of file