I never thought about the print percision. This with the previous post by Raul should get me going.
Alsothanks for the post about model of Tolerant Equal found at: http://www.jsoftware.com/jwiki/Essays/Tolerant%20Comparison cut/past from this page follows: ---------------------- The = dictionary page defines equality with a tolerance t thus: for finite x and y , x=y is 1 if the magnitude of x-y does not exceed t times the larger of the magnitudes of x and y . The tolerance is normally 2^_44 . Appendix C, System Conventions and Limits, says that the tolerance is less than or equal to 2^_34 . Historically, the upper bound on the tolerance was chosen so that comparisons involving 32-bit integers are exact (as if the tolerance is 0). ---------------------- thanks a lot! ----- Original Message Follows ----- From: Kip Murray <[email protected]> To: Programming forum <[email protected]> Subject: Re: [Jprogramming] using ^ and ^. Date: Mon, 15 Jun 2009 12:27:28 -0500 > 9!:11 [ 20 NB. Print precision 20 > > 2x ^. 2x ^ 47 >47.000000000000007 > > >[email protected] wrote: >> 2x ^. 2x ^ 607 >> 607 >> >> and even though it takes about 10 seconds on my machine. >> >> 2x ^. 2x ^ 444444 >> >> 444444 >> >> ^. and ^ do not seem to be a problem. >> >> ----- Original Message Follows ----- >> From: Raul Miller <[email protected]> >> To: Programming forum <[email protected]> >> Subject: Re: [Jprogramming] question on using ^ and ^. >> Date: Mon, 15 Jun 2009 12:15:57 -0400 >> >>> On Mon, Jun 15, 2009 at 12:06 PM, >>>> <[email protected]> wrote: Hum.... more >>>> observations: >>>> (-:!.0 <.) 2x ^. 2x^47 >>>> 0 >>> (- <.) 2x ^. 2x^47 >>> 7.10543e_15 >>> >>> The issue, I think, is the implementation >>> of ^. not recognizing an exact integer >>> result was possible. >>> >>> -- >>> Raul >>> >>> >----------------------------------------------------------- >>> ----------- 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
