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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