If you are using GHC the fastest way I know to do this
is to build the array using a mutable-unboxed array in the
state-monad. Then freeze the array and return an
unboxed immutable array. This is a lot faster than
building the array by copying (every time you set a
value in an immutable array the whole array much be
copied - for a sizeable image this is quite a lot of
work!)
Keean.
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