* 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_cast.cpp b/doc/snippets/MatrixBase_cast.cpp
index f59b97d..016880b 100644
--- a/doc/snippets/MatrixBase_cast.cpp
+++ b/doc/snippets/MatrixBase_cast.cpp
@@ -1,3 +1,3 @@
-Matrix2d md = Matrix2d::identity() * 0.45;
-Matrix2f mf = Matrix2f::identity();
+Matrix2d md = Matrix2d::Identity() * 0.45;
+Matrix2f mf = Matrix2f::Identity();
cout << md + mf.cast<double>() << endl;