Trigonometric Functions for the HP38C/HP12C

03252016, 04:51 AM
(This post was last modified: 03252016 04:51 AM by Gerson W. Barbosa.)
Post: #2




RE: Trigonometric Functions for the HP38C/HP12C
(03252016 03:30 AM)bshoring Wrote: Some time ago, Gerson Barbosa wrote a really nice program to compute Trig functions on the HP12C and its predecessor, the HP38C. 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 HP12C/38C using this approach, given their limited memory. I was able to get much better accuracy and functionality on the HP12C Platinum whose 20 registers are always available, even when all 400 programming steps are fully used: http://www.hpmuseum.org/cgisys/cgiwrap/...i?read=654 The linked TurboBCD program, for instance, provides 17digit 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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