[Haskell-cafe] Running Total or Incremental Sum as a higher order type ?

3 Jul 2004

      Hi

I was attempting to get a running a total of a list i.e

for [1,2,3]

the result should be

[1,3,6]   -- [1, 1+2, 2+3]

I build this function:

incrementalSum [] x = []
incrementalSum (x:xs) runningTotal = currentSum : incrementalSum xs 
currentSum
                                                     where
                                                           currentSum = 
runningTotal + x

I was trying to see how I could higher order functions for this but came up 
empty. Surely this is a pattern which has been abstracted ? I feel I have 
missed the obvious here.

Thanks,

S

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[Haskell-cafe] Running Total or Incremental Sum as a higher order type ?

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