Pierre-Etienne Meunier wrote:
This is mostly a question for Roman : how do you use your vector library with multi-dimensional arrays ? I mean, the array library from the standard libraries does something more intelligent than the C-like solution with indirections.
Vector doesn't include any support for multidimensional arrays. This is by design as the library has exactly one purpose: to provide a fast implementation of contiguous, one-dimensional arrays. As you point out, it is well possible to build multidimensional arrays on top of it but that would be a separate library. You might want to take a look at Repa (http://hackage.haskell.org/package/repa) which does exactly that (it sits on top of DPH which sits on top of vector). It also gives you parallelism. FWIW, I don't think we've nailed the "right" API for multidimensional arrays yet. It's a hard problem. But we are getting there. Roman