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I use this a fair bit:
a' = [ (f x, f y) | (x, y) <- a ]
Is there a better way to do that?
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The best way to apply a function to each element of a list is to use the Python built-in map() function that takes a function and one or more iterables as arguments. It then applies the function to each element of the iterables. An alternate way is to use list comprehension.
B = arrayfun( func ,A1,...,An) applies func to the elements of the arrays A1,...,An , so that B(i) = func(A1(i),...,An(i)) . The function func must take n input arguments and return a scalar.
lapply() function in R Programming Language is used to apply a function over a list of elements. lapply() function is used with a list and performs the following operations: lapply(List, length): Returns the length of objects present in the list, List.
You can use the (***) operator from Control.Arrow
> map (f *** f) a
or define your own helper function
> let both f (x, y) = (f x, f y)
> map (both f) a
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