#3659: two-dimensional PArrays in data parallel code
-----------------------------+----------------------------------------------
Reporter: ams | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler
Version: 6.10.4 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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Hi -- Is it possible to create two-dimensional PArrays? It seems like an
expression like
{{{
fromList [fromList [1]]
}}}
would do it (where fromList is from Data.Array.Parallel.Prelude), but a
type class constraint seems not to be matched here:
{{{
No instance for (Elt (PArray Int))
arising from a use of `fromList' at Main.hs:8:16-42
Possible fix: add an instance declaration for (Elt (PArray Int))
}}}
(Details below.) Are there any other ways?
Thanks -- Adam Shaw
{{{
$ cat Main.hs
import Data.Array.Parallel.PArray as P
main :: IO ()
main
= do
let v2D = P.fromList [P.fromList [1::Int]]
print v2D
$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.13.20090929
$ ghc -fdph-seq Main.hs
Main.hs:6:16:
No instance for (Elt (PArray Int))
arising from a use of `fromList' at Main.hs:6:16-47
Possible fix: add an instance declaration for (Elt (PArray Int))
In the expression: fromList [fromList [1 :: Int]]
In the definition of `v2D': v2D = fromList [fromList [1 :: Int]]
In the expression:
do { let v2D = fromList ...;
print v2D }
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3659>
GHC <http://www.haskell.org/ghc/>
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