I split the exponent into two pieces - the two partials differ by one in their exponents: 7830457 = 3915228 + 3915229. They are doing much of the same work.
On Thu, Jul 7, 2011 at 12:48 AM, Marshall Lochbaum < [email protected]> wrote: > How is the split-up calculation different (in terms of complexity) from > 1+28433* (*+:) 2x^3915228 > ? > > It seems that the partial1 and partial2 computations are doing exactly the > same job. > > Marshall > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Devon McCormick > Sent: Wednesday, July 06, 2011 6:29 PM > To: Programming forum > Subject: Re: [Jprogramming] Large numbers > > This took 0:46:37 in J and 0:53:28 in bc on my XP machine. However, when I > split the calculation into pieces, it was finished in less than 15 minutes. > > I ran the following two scripts simultaneously, using "fork" (which took > about six minutes), then loaded the results and made the final calculation: > load&.>'partial1.ijs';'partial2.ijs' > +++ > +++ > 6!:2 'ans0=. 1+28433*partial1*partial2' > 518.91352 > 10{.":ans0 > 7772839072 > #":ans0 > 2357207 > > The results above were produced by these two scripts: > > NB.* large1.ijs: portion of large calculation. > ans1=. 2x^3915228 > ('partial1=: ','x',~,":ans1) 1!:2 <'partial1.ijs' > 2!:55'' > > NB.* large2.ijs: portion of large calculation. > ans2=. 2x^3915229 > ('partial2=: ','x',~,":ans2) 1!:2 <'partial2.ijs' > 2!:55'' > > > On Wed, Jul 6, 2011 at 3:19 PM, Tracy Harms <[email protected]> wrote: > > > Yes, that makes more sense to me, too, with a bit more thought. > > > > > > On Wed, Jul 6, 2011 at 1:33 PM, Raul Miller <[email protected]> > wrote: > > > > > Mine is: > > > 1 + 28433 * 2 ^ 7830457x > > > > > > > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > > -- > Devon McCormick, CFA > ^me^ at acm. > org is my > preferred e-mail > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Devon McCormick, CFA ^me^ at acm. org is my preferred e-mail ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
