add fill() function as an alias for setConstant

Eigen/src/Core/CwiseNullaryOp.h

diff --git a/Eigen/src/Core/CwiseNullaryOp.h b/Eigen/src/Core/CwiseNullaryOp.h
index 0f914e7..691bc36 100644
--- a/Eigen/src/Core/CwiseNullaryOp.h
+++ b/Eigen/src/Core/CwiseNullaryOp.h
@@ -238,9 +238,19 @@
   return true;
 }
 
+/** Alias for setConstant(): sets all coefficients in this expression to \a value.
+  *
+  * \sa setConstant(), Constant(), class CwiseNullaryOp
+  */
+template<typename Derived>
+EIGEN_STRONG_INLINE void MatrixBase<Derived>::fill(const Scalar& value)
+{
+  setConstant(value);
+}
+
 /** Sets all coefficients in this expression to \a value.
   *
-  * \sa class CwiseNullaryOp, Zero(), Ones()
+  * \sa fill(), Constant(), class CwiseNullaryOp, setZero(), setOnes()
   */
 template<typename Derived>
 EIGEN_STRONG_INLINE Derived& MatrixBase<Derived>::setConstant(const Scalar& value)

Eigen/src/Core/MatrixBase.h

diff --git a/Eigen/src/Core/MatrixBase.h b/Eigen/src/Core/MatrixBase.h
index 41dd894..5281e34 100644
--- a/Eigen/src/Core/MatrixBase.h
+++ b/Eigen/src/Core/MatrixBase.h
@@ -446,6 +446,7 @@
 
     const DiagonalMatrix<Derived> asDiagonal() const;
 
+    void fill(const Scalar& value);
     Derived& setConstant(const Scalar& value);
     Derived& setZero();
     Derived& setOnes();

test/cwiseop.cpp

diff --git a/test/cwiseop.cpp b/test/cwiseop.cpp
index 01f6361..3d98845 100644
--- a/test/cwiseop.cpp
+++ b/test/cwiseop.cpp
@@ -46,6 +46,7 @@
   MatrixType m1 = MatrixType::Random(rows, cols),
              m2 = MatrixType::Random(rows, cols),
              m3(rows, cols),
+             m4(rows, cols),
              mzero = MatrixType::Zero(rows, cols),
              mones = MatrixType::Ones(rows, cols),
              identity = Matrix<Scalar, MatrixType::RowsAtCompileTime, MatrixType::RowsAtCompileTime>
@@ -57,6 +58,24 @@
 
   int r = ei_random<int>(0, rows-1),
       c = ei_random<int>(0, cols-1);
+  
+  Scalar s1 = ei_random<Scalar>();
+  
+  // test Zero, Ones, Constant, and the set* variants
+  m3 = MatrixType::Constant(rows, cols, s1);
+  for (int j=0; j<cols; ++j)
+    for (int i=0; i<rows; ++i)
+    {
+      VERIFY_IS_APPROX(mzero(i,j), Scalar(0));
+      VERIFY_IS_APPROX(mones(i,j), Scalar(1));
+      VERIFY_IS_APPROX(m3(i,j), s1);
+    }
+  VERIFY_IS_APPROX(m4.setConstant(s1), m3);
+  VERIFY_IS_APPROX(m4.setZero(), mzero);
+  VERIFY_IS_APPROX(m4.setOnes(), mones);
+  m4.fill(s1);
+  VERIFY_IS_APPROX(m4, m3);
+  
 
   m2 = m2.template binaryExpr<AddIfNull<Scalar> >(mones);
 
@@ -85,9 +104,13 @@
     VERIFY_IS_APPROX(m3.cwise().square(), m1.cwise().abs());
     VERIFY_IS_APPROX(m1.cwise().square().cwise().sqrt(), m1.cwise().abs());
     VERIFY_IS_APPROX(m1.cwise().abs().cwise().log().cwise().exp() , m1.cwise().abs());
+
+    VERIFY_IS_APPROX(m1.cwise().pow(2), m1.cwise().square());
+    m3 = (m1.cwise().abs().cwise()<0.01).select(mones,m1);
+    VERIFY_IS_APPROX(m3.cwise().pow(-1), m3.cwise().inverse());
+    m3 = m1.cwise().abs();
+    VERIFY_IS_APPROX(m3.cwise().pow(0.5), m3.cwise().sqrt());
     
-//     VERIFY_IS_APPROX(m1.cwise().pow(-1), m1.cwise().inverse());
-//     VERIFY_IS_APPROX(m1.cwise().pow(0.5), m1.cwise().sqrt());
 //     VERIFY_IS_APPROX(m1.cwise().tan(), m1.cwise().sin().cwise() / m1.cwise().cos());
     VERIFY_IS_APPROX(mones, m1.cwise().sin().cwise().square() + m1.cwise().cos().cwise().square());
     m3 = m1;