Trigonometric Functions for the HP-38C/HP-12C
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03-25-2016, 04:51 AM
(This post was last modified: 03-25-2016 04:51 AM by Gerson W. Barbosa.)
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RE: Trigonometric Functions for the HP-38C/HP-12C
(03-25-2016 03:30 AM)bshoring Wrote: Some time ago, Gerson Barbosa wrote a really nice program to compute Trig functions on the HP-12C and its predecessor, the HP-38C. Unfortunately more digits won't help here. In order to improve the accuracy you would need more constants, but then this wouldn't be possible on the HP-12C/38C using this approach, given their limited memory. I was able to get much better accuracy and functionality on the HP-12C Platinum whose 20 registers are always available, even when all 400 programming steps are fully used: http://www.hpmuseum.org/cgi-sys/cgiwrap/...i?read=654 The linked TurboBCD program, for instance, provides 17-digit accuracy. But it required the computation of 18 constants, 10 for arctangent and 8 for sine: http://www.geocities.ws/gwbarbosa/prgms_4.html Here, starting at page 8, is an explanation of the method: http://www.research.scea.com/research/pd..._GDC02.pdf Thank you for your interest in this old program of mine! Gerson. |
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