[Haskell-cafe] Mapping over multiple values of a list at once?

[Miguel Mitrofanov]

transpose & tails, I guess.

haskell at kudling.de wrote:
> Hi,
> 
> Imagine you have a list with n-values. You are asked to iterate over the list and calculate the average value of each 3 neighbouring values.
> 
> For example, starting from
> 
> [4,3,2,6,7]
> 
> you need to find the averages of
> 
> 4,3,2 and 3,2,6 and 2,6,7
> 
> resulting in 
> 
> [3,4,5]
> 
> What is the most elegant way to do that?
> The naive ansatz to use "(!!") excessively sounds pretty inefficient.
> 
> Bye,
> Lenny
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