Seems to work for me. I changed it a bit (I believe you meant 'len ar' on the first line, with the following defintion of 'len': len = (1+) . uncurry (flip (-)) . bounds , but other than that, I left your code as it is). Can you provide input on which it fails? It works for me on large input like: *Main> ind 1 "foo" $ listArray (1,10000) (concat $ repeat "abcfoodefgfooa") even in ghci. -- Hal Daume III | hdaume@isi.edu "Arrest this man, he talks in maths." | www.isi.edu/~hdaume

-----Original Message----- From: haskell-admin@haskell.org [mailto:haskell-admin@haskell.org] On Behalf Of Ketil Z. Malde Sent: Friday, June 20, 2003 7:05 AM To: haskell@haskell.org Subject: stack space overflow

Hi,

I have a small function to find all indices in an array where a given subword can be found, looking like this:

...

ind i ws ar | i+length ws-1 > len e = [] | and [ar!(i+j) == ws!!j | j<-[0..length ws-1]] = i : ind (i+1) ws ar | otherwise = ind (i+1) ws ar

(i::Int is the position, ws::[a] is the word to look for, while ar::Array Int a is the array wherein to look)

This occasionally blows up with a stack overflow, perhaps I'm being dense, but I'm not sure why. Any suggestions?

BTW, is there a general way to track down stack overflows? I use the -xc option, are there any other tricks I should know about? And does heap profiling (GHC) imply more stack usage -- I seem to get overflows much more easily when profiling.

-kzm -- If I haven't seen further, it is by standing in the footprints of giants _______________________________________________ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell