Hi all - I'm trying to run some code posted recently on this list ( the exact URI is as follows - http://comments.gmane.org/gmane.comp.lang.haskell.cafe/7860 ( The reason I'm doing this is because this code is quite close to what I'm trying to do. ) Anyway, I saved the code in a file called andy1.hs . The exact code is as follows - module Main where readVecs :: String -> IO [Vector3 GLfloat] readVecs f = do str <- readFile f let mkVec [x,y,z] = Vector3 x y z return $ map (mkVec . read . words) $ lines str ( I can see what the code seems to be doing : it's reading the file line-by-line, splitting it into "words", and filling the vectors with them. Not too bad a guess for a "Haskellista" of a few minutes standing ..... ;-) I created a small file with whitespace-separated floats so that I could run the above code. This data file looks like this - 23.596 38.201 79.903 32.647 65.559 15.438 21.648 34.978 90.089 55.587 76.763 96.634 When I run the above code (in GHCi , version 6.4) I get the message - Prelude> :load andy1 Compiling Main ( andy1.hs, interpreted ) andy1.hs:4:7: The last statement in a 'do' construct must be an expression Failed, modules loaded: none. So - I'm just wondering if anyone can see how the above code should be fixed in order to run. And just one last question - If the file looked like this (with column headings ) Name Ethnicity Age Mary_Smith NZ_European 27 Joe_Brown NZ_European 34 John_Watson Canadian 45 Mike_Tangaroa NZ_Maori 38 - what change would the above code need to run? Very many thanks in advance ... - Andy