Re: [Haskell-cafe] Array use breaks when I make it unboxed?

22 Feb 2009

      Thanks for the tip - I got it to work using:

a :: UArray Int Double

.... And so on.

Cheers,

Phil.

On 22/02/2009 01:05, "Felipe Lessa"  wrote:
...
2009/2/21 Phil :
...
InverseNormal.hs:28:38:
    No instance for (IArray a1 Double)
      arising from a use of `!' at InverseNormal.hs:28:38-40
    Possible fix: add an instance declaration for (IArray a1 Double)
    In the first argument of `(*)', namely `c ! 1'
    In the first argument of `(+)', namely `c ! 1 * q'
    In the first argument of `(*)', namely `(c ! 1 * q + c ! 2)'
'a1' here is the type of the key. Try something like
...
a = listArray (1 :: Int,6) [-3.969683028665376e+01, 2.209460984245205e+02,
                     -2.759285104469687e+02, 1.383577518672690e+02,
                     -3.066479806614716e+01, 2.506628277459239e+00]
or maybe
...
b :: UArray (Int, Int) Double
b = listArray (1,5) [-5.447609879822406e+01, 1.615858368580409e+02,
                     -1.556989798598866e+02, 6.680131188771972e+01,
                     -1.328068155288572e+01]
I think this is the problem.
HTH,