thanks John, essentially the same answer as Roger's, efficiency limits it to natural limit of 1e308odd with our present decimal64 format
I have since found more i pod touch apps with 1e308 odd upper limits (by the way, TI moved on to 68000 some time ago, and latest is TI Nspire CAS with ARM at unspecified speed and 32 Mb ROM and 32Mb RAM; slick machine mathematically/comuting wise) thanks so until we move onto decimal128 mode this is at it is. ----- Original Message ----- From: John Randall <[email protected]> Date: Tuesday, September 29, 2009 2:18 pm Subject: Re: [Jgeneral] anyone know the math/computing reason for calling exponents an end at +- 1e328 To: General forum <[email protected]> > DIETER ENSSLEN wrote: > > it gets even more confusing, I have an i pod touch App called > HiCalc that > > displays pi to 33 digits and lets me multiply it by 1e1003 and > more, way > > more. > > A calculator (real or simulated) is used interactively, and so there > is a lot more leeway to emulate higher precision arithmetic: > time is > not a factor. For the same reason, many Texas Instruments > calculatorsstill use the Z80 (an 8-bit chip) at 6 or 15 MHz. > > Best wishes, > > John > > > > ----------------------------------------------------------------- > ----- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
