Hello everybody,

 when I compile the file 

I get 

main.hs:28:64:

    Could not deduce (Enum (a, t0))

      arising from the arithmetic sequence `0 .. '

    from the context (Integral a)

      bound by the type signature for

                 plotAsString :: Integral a => [(a, a)] -> (a, a) -> String

      at main.hs:(26,1)-(38,41)

    Possible fix:

      add (Enum (a, t0)) to the context of

        the type signature for

          plotAsString :: Integral a => [(a, a)] -> (a, a) -> String

      or add an instance declaration for (Enum (a, t0))

    In the second argument of `zip', namely `[0 .. ]'

    In the first argument of `M.fromList', namely `(zip locs [0 .. ])'

    In the expression: M.fromList (zip locs [0 .. ])

main.hs:28:65:

    Could not deduce (Num (a, t0)) arising from the literal `0'

    from the context (Integral a)

      bound by the type signature for

                 plotAsString :: Integral a => [(a, a)] -> (a, a) -> String

      at main.hs:(26,1)-(38,41)

    Possible fix:

      add (Num (a, t0)) to the context of

        the type signature for

          plotAsString :: Integral a => [(a, a)] -> (a, a) -> String

      or add an instance declaration for (Num (a, t0))

    In the expression: 0

    In the second argument of `zip', namely `[0 .. ]'

    In the first argument of `M.fromList', namely `(zip locs [0 .. ])'

can somebody help?

Thanks,
Sunil.