Thank you, Roger. Kip Murray
Roger Hui wrote: > FYI: In J7.01 the monad ^...@j. is supported by special code, > so that: > > ^...@o. 0 j. 0.5 * i. 3 4 > 1 0j1 _1 0j_1 > 1 0j1 _1 0j_1 > 1 0j1 _1 0j_1 > > ^...@o. 0 j. 2e9 + 0.5 * i. 3 4 > 1 0j1 _1 0j_1 > 1 0j1 _1 0j_1 > 1 0j1 _1 0j_1 > > > > ----- Original Message ----- > From: DIETER ENSSLEN <[email protected]> > Date: Tuesday, January 19, 2010 13:51 > Subject: [Jchat] J and CAS, and problems in CAS > To: chat forum <[email protected]> > >> CAS computer algebra systems >> >> e^(pi *i)+ 1 actually equals a nice zero, yes it is nice >> OK OK OK >> >> I do look forward to more of CAS in J. >> >> But there lurk problems in that world, too: >> The world's most powerful and best graphing calculator, the TI >> Nspire cas evaluates the integral from -1 to 1 of 1/sqrt(1-x^2) >> nicely as 'pi' in symbol form. >> >> then if you ask for the approximation of that 'pi' you get a >> number that is different from the regular 'pi' by two >> significant digits?! ..5862 vs ..5898 , the last figures >> to 14 places. A difference of -3.6e-12. J gives ..5897 931. >> >> this must make sense to some or many of you. Good luck in the >> move towards 'cas' >> >> by the way, this my computer does not let me type TI-Nspire >> followed with the capital letters CAS without dropping the line >> again and again and again. This too must make sense to several >> of you. > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
