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. > ---------------------------------------------------------------------- > 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
