* Merge Extract and Part to the Part expression.
Renamed "MatrixBase::extract() const" to "MatrixBase::part() const"
* Renamed static functions identity, zero, ones, random with an upper case
first letter: Identity, Zero, Ones and Random.
diff --git a/doc/snippets/MatrixBase_setIdentity.cpp b/doc/snippets/MatrixBase_setIdentity.cpp
index 17a706c..4fd0aa2 100644
--- a/doc/snippets/MatrixBase_setIdentity.cpp
+++ b/doc/snippets/MatrixBase_setIdentity.cpp
@@ -1,3 +1,3 @@
-Matrix4i m = Matrix4i::zero();
+Matrix4i m = Matrix4i::Zero();
m.block<3,3>(1,0).setIdentity();
cout << m << endl;