AFAIU you can't count the number of linear calls this way. It doesn't
count the first time.
n=:0
v/9
9
n
0
Hallo Viktor Cerovski, je schreef op 20-02-10 01:36:
>
> Zsbán Ambrus wrote:
>
>> Dear Jsoftware,
>>
>> Is there any chance that a future J version would optimize the monad
>> u/\. for any verb u to make only linear number of calls to u instead
>> of quadratic?
>>
>> I know this would break the case when u has side effects, but I still
>> believe this would be a useful feature (if documented), for it would
>> help in lots of cases but break only little code.
>>
>> As a model, for any verb u and noun y, (u/\. y) could be executed as
>> if it was (>,(];~>@[u>@{...@])/<"_1 y).
>>
>> Ambrus
>> ----------------------------------------------------------------------
>> For information about J forums see http://www.jsoftware.com/forums.htm
>>
>>
>>
> Linear number of calls can be also checked out like this:
>
> v =: dyad : 0
> n=:n+1
> x + y
> )
> n=:0
> v/\.i.10
> 45 45 44 42 39 35 30 24 17 9
> n
> 9
> +/\.i.10
> 45 45 44 42 39 35 30 24 17 9
>
> DoJ says: "u\.y has #y items resulting from applying u
> to suffixes of y ,[...]". If we stick to this definition, what should
> be the value of n in the above example?
>
--
Met vriendelijke groet,
=@@i
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