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-Repa-Repr-Vector.html
[2] http://www.cse.unsw.edu.au/~benl/papers/guiding/guiding-Haskell2012-sub.pdf
Ben.
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