Look at the type of tail: tail :: [a] -> [a]
That is, tail is the list of all elements *except* the head. You want "last". (Barring style considerations. Usually in a situation like this you would use a list of tuples rather than a list of lists, since then you know at compile time that you have exactly two numbers in each element of the list). Luke On Feb 2, 2008 6:30 AM, Logesh Pillay <[EMAIL PROTECTED]> wrote: > I have a list. Each component is a list with 2 whole numbers. I want > to multiply the second number by the log of the first > eg > tail ([519432,525806]) * log (head [519432,525806]). > > I get the ffg error message: > > No instance for (Floating [t]) > arising from a use of `log' at <interactive>:1:25-50 > Possible fix: add an instance declaration for (Floating [t]) > In the second argument of `(*)', namely > `log (head [519432, 525806])' > In the expression: > tail ([519432, 525806]) * log (head [519432, 525806]) > In the definition of `it': > it = tail ([519432, 525806]) * log (head [519432, 525806]) > > > I've tried the only type signature I know "fromIntegral" but it does not > help. > > How to fix? > > Thanks > Logesh > > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe