On Thu, 8 May 2008, Madoc wrote:
Given a list of numbers, I want to modify each of those numbers by adding a random offset. However, each such modified number shall stay within certain bounds, given by the integers minValue and maxValue. After that, I want to continue computation with the resulting list of type [Int]. But for demonstration, I made a program that just prints out the list:
import IO; import Random
minValue = 0::Int maxValue = 1000::Int
normalize a | a < minValue = minValue | a > maxValue = maxValue | otherwise = a
normalize = min maxValue . max minValue
modify a = do offset <- randomRIO(-100::Int, 100) return(normalize(a + offset))
Stay away from IO whereever possible, use randomR instead. Say map normalize (zipWith (+) (randomRs (-100::Int, 100)) x) http://haskell.org/haskellwiki/Humor/Erlkönig http://haskell.org/haskellwiki/Things_to_avoid#Separate_IO_and_data_processi...