On 03/06/2012, at 18:10 , Stuart Hungerford wrote:
I need to construct a 2D array of a Haskell data type ("boxed" ?) where each array entry value depends on values "earlier" in the same array (i.e. for entries in previous row/column indexes).
It should work. Use the V type-index for boxed arrays [1], so your array type will be something like (Array V DIM2 Float) If you can't figure it out then send me a small list program showing what you want to do.
Repa (V3.1.4.2) looks very powerful and flexible but it's still not clear to me that it will work with arbitrary values as I haven't been able to get any of the Wiki tutorial array creation examples to work (this is with Haskell platform 2012.2 pre-release for OS/X).
The wiki tutorial is old. It was written for the Repa 2 series, but Repa 3 is different. However I just (just) submitted a paper on Repa 3 to Haskell Symposium, which might help [2] [1] http://hackage.haskell.org/packages/archive/repa/3.1.4.2/doc/html/Data-Array... [2] http://www.cse.unsw.edu.au/~benl/papers/guiding/guiding-Haskell2012-sub.pdf Ben.