I'm still trying to get an intuitive understanding of Haskell's Data.Array http://hackage.haskell.org/package/array-0.5.1.1/docs/Data-Array.html#g:5, in contrast to Data.List or Data.Vector. I very much want a nested array (a matrix), where the parent list (or rows) are reversed. But neither *A.array* nor *A.istArray* allow indicies to be reversed in their constructors, nor the list comprehensions that generate the elements The only reason I'm using an array, is for the *A.//* function (operating on a matrix). Otherwise, I'd use Data.Vector https://hackage.haskell.org/package/vector-0.11.0.0/candidate/docs/Data-Vect... which does have a reverse function, but a less powerful *V.//* , that doesn't accept coordinates in a matrix. Can I reverse a Data.Array? If not, then why. Thanks Tim