Whenever you use ?. it begins again at the same starting point of a random
sequence for your system. I didn'try enough examples:
]R=:?4#100
48 43 50 59
]R=:?4#100
12 74 85 21
]R=:?.4#100
46 55 79 52
]R=:?.4#100
46 55 79 52
]R=:?.4#100
46 55 79 52
]R=:?4#100
6 67 55 61
]R=:?4#100
0 47 63 71
]R=:(?100),(?.100),?.100
74 46 46
]R=:?.4#100
46 55 79 52
]R=:?4#100
34 67 69 38
Linda
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Ric Sherlock
Sent: Tuesday, December 11, 2012 9:05 PM
To: Programming JForum
Subject: Re: [Jprogramming] convert 0,1 coding to _1,1
According to the Dictionary ?. uses a fixed random seed ( 7^5 ) and a fixed
RNG so it should always give the same result no matter how many uses of ?
prior to its use.
I suspect that any differences observed from one machine/session to another
are caused by differences in the bitness (32 vs 64) or differences in the
underlying processor architecture (Intel vs AMD).
On Wed, Dec 12, 2012 at 1:56 PM, Linda Alvord
<[email protected]>wrote:
> I think the first digit of ?. locks in a seed and a sequence of
> random digits and then that sequence will be used in all examples in
> that session each time ? is used.
> If 30 random numbers are used in an application, when another
> application is used that session.o
>
> To get "new" random numbers, use ? , but if you now use ?. you
> can't guarantee that someone will have done the same number of uses of ?
> already.
> Thus there is no guarantee that thy will agree. However, you can now
> use that new seed until you change from ?. back to "real random".
>
> I hope this true and really what happens, I'm sure there will be
> someone who will set the record straight.
>
> Linda
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Brian
> Schott
> Sent: Tuesday, December 11, 2012 6:28 PM
> To: [email protected]
> Subject: Re: [Jprogramming] convert 0,1 coding to _1,1
>
> Linda,
>
> Yes, I get your same result on my iPad.
> But, I do not get the same result when instead of 1000, 2 is used on
> my iPad and my desktop. That is peculiar, but ... .
>
> On Tue, Dec 11, 2012 at 5:12 PM, Linda Alvord
> <[email protected]>
> wrote:
> > Try just the first line of this in a new version (as the first use
> > of
> > ?.) in J701jhs or J701gtk and or any old J's you can find and the
> > result should be the same:
> >
> > ]A=.?.3#1000
> > 146 755 79
> >
> >
>
> --
> (B=)
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
