* coefficient wise operators are more generic, with controllable result type.

- compatible with current STL's functors as well as with the extention proposal (TR1)
 * thanks to the above, Cast and ScalarMultiple have been removed
 * benchmark_suite is more flexible (compiler and matrix size)

doc/examples/class_CwiseUnaryOp.cpp

@@ -0,0 +1,17 @@
+#include <Eigen/Core>
+USING_PART_OF_NAMESPACE_EIGEN
+using namespace std;
+
+// define a custom template binary functor
+template<typename Scalar>
+struct CwiseClampOp EIGEN_EMPTY_STRUCT {
+    CwiseClampOp(const Scalar& inf, const Scalar& sup) : m_inf(inf), m_sup(sup) {}
+    Scalar operator()(const Scalar& x) const { return x<m_inf ? m_inf : (x>m_sup : m_sup : x); }
+};
+
+int main(int, char**)
+{
+  Matrix4d m1 = Matrix4d::random(), m2 = Matrix4d::random();
+  cout << m1.cwise(m2, CwiseClampOp<Matrix4d::Scalar>(-0.5,0.5)) << endl;
+  return 0;
+}