How does one delare a 2D STUArray in Haskell?
I see the following from a diffusion program segment:
module Diffusion where
import Data.Array
import Data.List (sortBy)
type VFieldElem = Float
type VField = Array (Int,Int) VFieldElem
<snip>
zeros = listArray ((1,1),(imax,jmax)) (repeat 0)
From Real World Haskell to declare a 1D array (I changed some of the
value names) there is the following:
import Data.Array.ST (STUArray)
import Data.Array.Unboxed (UArray)
import Data.Word (Word32)
data PlayingField1D a = PF1D {
pf1DState :: (a -> [Word32])
, pf1DArray :: UArray Word32 Bool
}
data MutPlayingField1D s a = MPF1D {
mpf1DState :: (a -> [Word32])
, mutpf1DArray :: STUArray s Word32 Bool
}
But I cannot see how to declare a 2D array.
Although, it is not "strictly" necessary, pun intended, since one can
reframe the 1D array as 2D array by using row/column mapping
functions.
--
Regards,
Casey
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