[Jprogramming] ? and ?. have different ranks

[Brian Schott]

If ? had the rank of ?. , it would still behave as ? , if these examples
are relevant.

   ?."? 2 10 $100
94 94 94 94 94 94 94 94 94 94
94 94 94 94 94 94 94 94 94 94
   ?"?. 2 10 $100
54 83  5 96 96 31 83 59 79 54
81 80 49 68 32 12 92 66 50 92

But on a similar, but different, issue: I have long sought in J a
*portable* RNG (although my research has veered away from this pursuit). By
portable, I mean one that can produce the same stream of numbers on any
modern computer, regardless of the word length. For an extreme example, on
my iPad, the first example produces all 46's, not 94's. The links below
discuss this issue.

http://www.jstor.org/discover/10.2307/2347988
http://degiorgi.math.hr/aaa_sem/Rand_Gen/p132-schrage.pdf



On Fri, Jan 24, 2014 at 8:38 AM, Ben Gorte - CITG <B.G.H.Gorte at tudelft.nl>wrote:

> I see...
>
> In fact your question is why monadic ? has rank 0, instead of _ , which
> would make it like behave more like ?. concerning b. 0 .
>
> We agree that a rank 0 ?. wouldn't be useful:
>
>    querydot =: (?.)"0
>    querydot (10#100)
> 46 46 46 46 46 46 46 46 46 46
>    querydot"1 (10#100)
> 46 46 46 46 46 46 46 46 46 46
>
> Is your question (if it is) not the same sort of question as why +, -, *
> etc. have rank 0?
> Or: what's wrong with:
>
>    11 12 13 +"_ i.3 4
> 11 12 13 14
> 16 17 18 19
> 21 22 23 24
>
> (I don't kow)
>
> Ben
>
-- 
(B=)