50 digits precision handheld calculator is it achievable or not?

01202014, 07:31 PM
Post: #21




RE: 50 digits precision handheld calculator is it achievable or not?
Hi
I wrote the longfloat Library years ago. I have a (alpha) version in hpgcc3 R002 based on the decnumber library. This has complex math of standard functions including (inverse) trigometric and hyperbolic functions. It is *much* faster, but require that you install an upgraded rom in order to run hpgcc3. There is no support for intervall arithmetic. There is no support for automatic function evaluation. There are issues with rounding of results which I didn't manage to solve. Thus to make a finished product it requires help from one who is proficient in hpgcc3 and decnumber... and there are not many such people around. Best regards Gjermund Skailand 

01262014, 06:14 AM
Post: #22




RE: 50 digits precision handheld calculator is it achievable or not?
(01172014 10:53 AM)JeanMarc Wrote: This is a hypothetical question. Can a 50 digits precision handheld calculator be achievable with today's technology? I am not a programmer. I was just curious to know the numerous hurdles to accomplish such a task. It would be quite straightforward, There are readily available free optimized arbitrary precision libraries out there, and it wouldn't be much work to port them to the modern ARM CPUs used in calculators. http://en.wikipedia.org/wiki/Arbitraryp...arithmetic GMP is the most common one and would optimize very well on ARM, multiprecision arithmetic is common enough CPUs have instructions that lend themselves to it. https://gmplib.org/ In fact, every unix (or derivative such as linux) system comes with an RPN arbitrary precision calculator called 'dc' originally written in 1965! It is quite likely one of the oldest computer programs still used regularly basically unchanged from when it was introduced (other than porting it to newer machines, and languages, it predates the C language even). ; echo "2 222 ^ p"  dc 6739986666787659948666753771754907668409286105635143120275902562304 (^ is exponent, p means print the top of the stack) John 

01262014, 10:11 AM
Post: #23




RE: 50 digits precision handheld calculator is it achievable or not?
Most arbitrary precision libraries work in base two which isn't overly suitable for a calculator. dc (and its companion bc), work in decimal I believe.
 Pauli 

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