[Haskell-cafe] Change value of a variable

[Jeff Heard]

Sounds like a fold to me. Try looking at the doc of either foldl/r/l'
or mapAccum depending on what you want..  Then write a function for
one iteration that returns the value from that iteration combined with
the value from the last iteration

-- Jeff

On Sun, Jun 7, 2009 at 3:44 PM, ptrash<ptrash at web.de> wrote:
>
> What i am exactly to do is this:
>
> I have a list of pupils (type Pupil = (Name, Grade)) where I store the name
> of the pupil and which grade he has. No I want to get the number (and
> average number) of each grade. Something like 10 Pupils have a A (23%), 2
> Pupils have a B ( 4 %) etc
> --
> View this message in context: http://www.nabble.com/Change-value-of-a-variable-tp23913404p23914558.html
> Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.
>
> _______________________________________________
> Haskell-Cafe mailing list
> Haskell-Cafe at haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe
>