Haskell Infinite calculation :Pascal’s_triangle

–For details of Pascal’s_triangle go through : http://en.wikipedia.org/wiki/Pascal’s_triangle

— Haskell is good at lazy evaluation ,Using that here is infinite Pascal’s_triangle

pascalTriangle = lazyPascaltriangle [1]

lazyPascaltriangle xs = xs : lazyPascaltriangle((head xs):pairSum xs)

where pairSum [] = []
pairSum [x] = [x]
pairSum (x:y:xs) = (x+y):pairSum (y:xs)

–sample run
take 6 pascalTriangle

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