[Haskell-cafe] Change value of a variable

Jeff Heard jefferson.r.heard at gmail.com
Sun Jun 7 15:51:22 EDT 2009

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
> --
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