Type declaration error
To Anthony Widjaja
18 Jul 2001 23:26:14 -0000
I've just tried writing a small code uses a function (/).
When hugs compiled it, it turned out that the type declaration is the error. For function every function (/) you had to use type class Fractional it says. But do we have to use Fractional every time we include (/)?
the code is as follows:
more_less :: [(Int,Int)] -> ([(Int,Int)],[(Int,Int)])
more_less x = ([ m | m <- x, map (snd x) >= mean x], [ l | l <- x, map (snd x) < mean x]
mean x = (sum (map snd x))/(length x)
What the code is intended to do is take a list of [(Int,Int)] and sort out the list in terms of their second value compared to the mean of the mean of the second values.
I look forward to hearing from everyone. Thanks
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