On Mon, 29 Mar 2004, Fred Nicolier wrote:
Is there a way to get the number of dimension of an array ? i.e. something like :
dims :: (Ix a) => Array a b -> Int dims = ... a = listArray (1,10) [1,2..] b = listArray ((1,1),(10,10)) [1,2..] dims a -- should be equal to 1 dims b -- should be equal to 2
The key is somewhere in the Ix class but where ?
In a sense Haskell arrays are always one dimensional. But as you noted tuples are used to achieve higher dimensionality. As far as I know there is no way of asking for the dimension of an array. You could write your own class for that though. Here's a suggestion: \begin{code} dims :: (Ix a, HasDimension a) => Array a b -> Int dims arr = dimension (head (range arr)) class HasDimension a where dimension :: a -> Int instance HasDimension Int where dimension _ = 1 instance HasDimension Float where dimension _ = 1 instance HasDimension (a,b) where dimension _ = 2 instance HasDimension (a,b,c) where dimension _ = 3 \end{code} And so forth. Beware. The code is untested. Hope this helps. /Josef