[erlang-questions] "Symmetrical" function
Wed Feb 18 00:05:06 CET 2009
On 17 Feb 2009, at 7:13 pm, Michael Radford wrote:
>> oi([X|Xs], [Y|Ys]) ->
>> if X < Y -> oi(Xs, [Y|Ys])
>> ; X > Y -> oi([X|Xs], Ys)
>> ; true -> oi(Xs, Ys)
>> oi(_, _) ->
>> Here #A is infinite, the number of clauses is 2, and I don't see
>> any good way to write half of f.
> I think you can write just the diagonal...
> oi(_, _) -> .
Yeah, thinko there. Change that to
oi([X|Xs], [Y|Ys]) ->
if X < Y -> oi(Xs, [Y|Ys])
; X > Y -> oi([X|Xs], Ys)
; true -> [X|oi(Xs, Ys)] % the mistake was here
oi(_, _) ->
The substantive point remains. I don't see any good way
to write half of <the function I *meant* to write>.
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