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
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