Re: Passing a matrix from C to Haskell

Chris Kuklewicz wrote:

Cyril Schmidt wrote:

...

I need to pass a big 2-dimensional array of doubles from a legacy C code to a Haskell module. Of this huge array, the Haskell code will actually use only a few elements (say, 10 out of 100x20 matrix). Unfortunately, the C code does not know which data are actually needed in the Haskell module.

You probably want Foreign.Marshal.Array

http://www.haskell.org/ghc/docs/6.4.1/html/libraries/base/Foreign-Marshal-Ar...

peekArray :: Storable a => Int -> Ptr a -> IO [a]

This works, but peekArray is very slow. Cheers Cyril