Peter Braam wrote:
Hi -
I'm trying to compile DotP.hs from http://www.haskell.org/haskellwiki/GHC/Data_Parallel_Haskell#A_simple_exampl... (see below)
The compiler complains and says (twice in fact):
DotP.hs:17:33: Not in scope: `fromPArrayP'
Could someone help me out please? Thanks a lot!
The code you posted had some wrapping issues and was missing an import. I've included a version of the code that compiles for me here (using ghc fromgit HEAD) using: ghc -c -Odph -fdph-par DotP.hs HTH, Erik {-# LANGUAGE ParallelArrays #-} {-# OPTIONS_GHC -fvectorise #-} module DotP (dotp_wrapper) where import qualified Prelude import Data.Array.Parallel import Data.Array.Parallel.Prelude import Data.Array.Parallel.Prelude.Double dotp_double :: [:Double:] -> [:Double:] -> Double dotp_double xs ys = sumP [:x * y | x <- xs | y <- ys:] dotp_wrapper :: PArray Double -> PArray Double -> Double {-# NOINLINE dotp_wrapper #-} dotp_wrapper v w = dotp_double (fromPArrayP v) (fromPArrayP w) -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/