diff --git a/src/Data/NumIdr/Array/Order.idr b/src/Data/NumIdr/Array/Order.idr
new file mode 100644
index 0000000..022ffdc
--- /dev/null
+++ b/src/Data/NumIdr/Array/Order.idr
@@ -0,0 +1,30 @@
+module Data.NumIdr.Array.Order
+
+import Data.Vect
+import Data.Permutation
+
+%default total
+
+
+export
+Order : (rk : Nat) -> Type
+Order = Permutation
+
+export
+COrder : {rk : Nat} -> Order rk
+COrder = identity
+
+export
+FOrder : {rk : Nat} -> Order rk
+FOrder = reversed
+
+
+scanr : (el -> res -> res) -> res -> Vect len el -> Vect (S len) res
+scanr _ q0 []      = [q0]
+scanr f q0 (x::xs) = f x (head qs) :: qs
+  where qs : Vect len res
+        qs = scanr f q0 xs
+
+export
+calcStrides : Order rk -> Vect rk Nat -> Vect rk Nat
+calcStrides ord v = permuteVect ord $ tail $ scanr (*) 1 v
diff --git a/src/Data/NumIdr/Array/Utils.idr b/src/Data/NumIdr/Array/Utils.idr
new file mode 100644
index 0000000..5364a5a
--- /dev/null
+++ b/src/Data/NumIdr/Array/Utils.idr
@@ -0,0 +1,12 @@
+module Data.NumIdr.Array.Utils
+
+import Data.NumIdr.Array.Array
+
+
+export
+zeros : Num a => (s : Vect rk Nat) -> Array s a
+zeros = constant 0
+
+export
+ones : Num a => (s : Vect rk Nat) -> Array s a
+ones = constant 1