I want to propose the following function slide, which is like map, but
depends not on one value of
a list, but on several consecutive ones.
slide :: ([a] -> b) -> [a] -> [b]
slide f [] = []
slide f xs = f xs : slide f (tail xs)
For example, this is useful for a digital filter, like
lowpass = firfilter [0.005178,0.005712,0.00589,0.005712,0.005178]
firfilter :: [Coeff] -> DigitalFilter
firfilter b = slide (firfilter' b)
where
firfilter' b = sum . zipWith (*) b
What do you think? Or is there already a function slide, just with another
name?
Markus
--
Markus Schnell, Infineon Technologies AG
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