diff --git a/doc/examples/Cwise_erf.cpp b/doc/examples/Cwise_erf.cpp
new file mode 100644
index 000000000..e7cd2c1c0
--- /dev/null
+++ b/doc/examples/Cwise_erf.cpp
@@ -0,0 +1,9 @@
+#include <Eigen/Core>
+#include <unsupported/Eigen/SpecialFunctions>
+#include <iostream>
+using namespace Eigen;
+int main()
+{
+  Array4d v(-0.5,2,0,-7);
+  std::cout << v.erf() << std::endl;
+}
diff --git a/doc/examples/Cwise_erfc.cpp b/doc/examples/Cwise_erfc.cpp
new file mode 100644
index 000000000..d8bb04c30
--- /dev/null
+++ b/doc/examples/Cwise_erfc.cpp
@@ -0,0 +1,9 @@
+#include <Eigen/Core>
+#include <unsupported/Eigen/SpecialFunctions>
+#include <iostream>
+using namespace Eigen;
+int main()
+{
+  Array4d v(-0.5,2,0,-7);
+  std::cout << v.erfc() << std::endl;
+}
diff --git a/doc/examples/Cwise_lgamma.cpp b/doc/examples/Cwise_lgamma.cpp
new file mode 100644
index 000000000..f1c4f503e
--- /dev/null
+++ b/doc/examples/Cwise_lgamma.cpp
@@ -0,0 +1,9 @@
+#include <Eigen/Core>
+#include <unsupported/Eigen/SpecialFunctions>
+#include <iostream>
+using namespace Eigen;
+int main()
+{
+  Array4d v(0.5,10,0,-1);
+  std::cout << v.lgamma() << std::endl;
+}
\ No newline at end of file
diff --git a/doc/snippets/Cwise_erf.cpp b/doc/snippets/Cwise_erf.cpp
deleted file mode 100644
index 7f51c1b6a..000000000
--- a/doc/snippets/Cwise_erf.cpp
+++ /dev/null
@@ -1,2 +0,0 @@
-Array4d v(-0.5,2,0,-7);
-cout << v.erf() << endl;
diff --git a/doc/snippets/Cwise_erfc.cpp b/doc/snippets/Cwise_erfc.cpp
deleted file mode 100644
index f0453d4b1..000000000
--- a/doc/snippets/Cwise_erfc.cpp
+++ /dev/null
@@ -1,2 +0,0 @@
-Array4d v(-0.5,2,0,-7);
-cout << v.erfc() << endl;
diff --git a/doc/snippets/Cwise_lgamma.cpp b/doc/snippets/Cwise_lgamma.cpp
deleted file mode 100644
index cbc69b989..000000000
--- a/doc/snippets/Cwise_lgamma.cpp
+++ /dev/null
@@ -1,2 +0,0 @@
-Array4d v(0.5,10,0,-1);
-cout << v.lgamma() << endl;
\ No newline at end of file