Hi there.

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Does anybody know how to call Fortran procedures in Haskell program? I tried Green Card, but seems it only works with C codes.

Sigbjorn Finne posted a way of doing this a while back, possibly on this list, maybe the GHC one. He used the FFI and a simple squaring function. Below is an extension using an integer array. Note that I've had to double the array size. $ g77 -c atest.f $ ghc -fglasgow-exts main.hs -o main.exe $ ./main [1,3,0,0,2,4,0,0] If you go any further, please let me know as I want to interface to LAPACK. Cheers Mike Thomas. ................................................ module Main where import Ptr import Storable import MarshalArray import MarshalUtils import MarshalAlloc foreign import "atest_" unsafe atest_ :: Ptr Int -> Ptr Int -> IO Int atest :: Int -> IO [Int] atest x = withObject x $ \ ptr_x -> allocaArray x $ \ ptr_a -> do atest_ ptr_x ptr_a peekArray (x*2) ptr_a main = atest 4 >>= print --square :: Int -> IO Int --square x = -- withObject x $ \ ptr_x -> -- alloca $ \ ptr_res -> do -- square_ ptr_x ptr_res -- peek ptr_res ................................................ SUBROUTINE ATEST(N,M) DIMENSION M(N,N) M(1,1)=1 M(1,2)=2 M(2,1)=3 M(2,2)=4 RETURN END ................................................