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returns the element of [a] at coordinates ([x], [y]).
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[x] and [y] must be within the bounds
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of [a], as described for {!Bigarray.Genarray.get};
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external set: ('a, 'b, 'c) t -> int -> int -> 'a -> unit = "%caml_ba_set_2"
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(** [Array2.set a x y v], or alternatively [a.{x,y} <- v],
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stores the value [v] at coordinates ([x], [y]) in [a].
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[x] and [y] must be within the bounds of [a],
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548
as described for {!Bigarray.Genarray.set};
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551
external sub_left: ('a, 'b, c_layout) t -> int -> int -> ('a, 'b, c_layout) t