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\DOC itlist2
\TYPE {itlist2 : ('a -> 'b -> 'c -> 'c) -> 'a list -> 'b list -> 'c -> 'c}
\SYNOPSIS
Applies a paired function between adjacent elements of 2 lists.
\KEYWORDS
list.
\DESCRIBE
{itlist2 f ([x1;...;xn],[y1;...;yn]) z} returns
{
f x1 y1 (f x2 y2 ... (f xn yn z)...)
}
\noindent It returns {z} if both lists are empty.
\FAILURE
Fails if the two lists are of different lengths.
\EXAMPLE
This takes a `dot product' of two vectors of integers:
{
# let dot v w = itlist2 (fun x y z -> x * y + z) v w 0;;
val dot : int list -> int list -> int = <fun>
# dot [1;2;3] [4;5;6];;
val it : int = 32
}
\SEEALSO
itlist, rev_itlist, end_itlist, uncurry.
\ENDDOC
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