the Index types change.
As discussed on the list (too long to explain here).

test/array_for_matrix.cpp

diff --git a/test/array_for_matrix.cpp b/test/array_for_matrix.cpp
index 516c040..477d178 100644
--- a/test/array_for_matrix.cpp
+++ b/test/array_for_matrix.cpp
@@ -124,9 +124,12 @@
 
   // count
   VERIFY(((m1.array().abs()+1)>RealScalar(0.1)).count() == rows*cols);
+
+  typedef Matrix<typename MatrixType::Index, Dynamic, 1> VectorOfIndices;
+
   // TODO allows colwise/rowwise for array
-  VERIFY_IS_APPROX(((m1.array().abs()+1)>RealScalar(0.1)).matrix().colwise().count(), RowVectorXi::Constant(cols,rows));
-  VERIFY_IS_APPROX(((m1.array().abs()+1)>RealScalar(0.1)).matrix().rowwise().count(), VectorXi::Constant(rows, cols));
+  VERIFY_IS_APPROX(((m1.array().abs()+1)>RealScalar(0.1)).matrix().colwise().count(), VectorOfIndices::Constant(cols,rows).transpose());
+  VERIFY_IS_APPROX(((m1.array().abs()+1)>RealScalar(0.1)).matrix().rowwise().count(), VectorOfIndices::Constant(rows, cols));
 }
 
 template<typename VectorType> void lpNorm(const VectorType& v)