Yes, android is 32 bit. 64 bit android isn't widely available yet as far as
I know
64 bit linux gave the same results as 64 bit windows
? 10 $ 100 [ 9!:1 ] 79 233 122
99 45 95 82 5 12 75 0 88 21
It does look like there is different logic for 64 vs 32 bit:
https://github.com/openj/core/blob/18fd23bbdc2f50770eb3047e978cd5e4e3b47039/vrand.c#L204
vrand.c, look for: jtmt_init_by_array
On Wed, Apr 16, 2014 at 11:11 AM, Pascal Jasmin <[email protected]>wrote:
> that happens to be the same as J6 -32. Is android 32 bit?
>
> 128!:4 seems to be different than the "advertised spec" on 64 bit windows
> versions:
>
> It produces apparent 64 bit range numbers instead of 2^32 advertised upper
> bound for Mersenne Twister.
>
>
> ----- Original Message -----
> From: Joe Bogner <[email protected]>
> To: [email protected]
> Cc:
> Sent: Wednesday, April 16, 2014 11:05:53 AM
> Subject: Re: [Jprogramming] 32 and 64 bit compatibility for ? and 9!:1
>
> Android results are different
>
> ? 10 $ 100 [ 9!:1 ] 79 233 122
> 69 66 18 2 40 41 94 12 72 87
>
> On Apr 16, 2014 10:51 AM, "Pascal Jasmin" <[email protected]> wrote:
>
> > this gives consistent results accross 64 bit versions of J on windows
> > (default Mersenne Twister)
> >
> > ? 10 $ 100 [ 9!:1 ] 79 233 122
> > 99 45 95 82 5 12 75 0 88 21
> >
> >
> > does it also give the same result on 64bit android osx linux?
> >
> > On J6-32, there is a different result.
> >
> > I notice that 9!:44 structure appears to be:
> > 2 (Mersenne T RNG; offset taken so far; 312 64 bit numbers or 624 32 bit
> > numbers depending on J version.
> >
> > for 9!:45, it appears as though the length of the 3rd box must match 312
> > or 624.
> >
> > Also ?. provides different results in 32 vs 64 bits
> >
> > Is there a possible conversion for seed or state that will produce the
> > same results on 32 and 64 bits?
> >
> > 624 = 312 * 2... perhaps there is some alternate memcopy procedure?
> >
> > tried _2*/\624 $ list of 32 bit numbers for 3rd box, but gives a domain
> > error on 64 bits, even though it produces the right 312 shape. So it
> > appears the state array must be less than 64 bit values.
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> >
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