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Trigonometric Functions for the HP-38C/HP-12C
03-25-2016, 03:30 AM
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Trigonometric Functions for the HP-38C/HP-12C
Some time ago, Gerson Barbosa wrote a really nice program to compute Trig functions on the HP-12C and its predecessor, the HP-38C.

I'm interested in the source of the coefficients:

-3.333324820E-01 STO 1
1.998722722E-01 STO 2
-1.397054038E-01 STO 3
-8.860960894E-07 STO 4
1.349561365E-11 STO 5
-9.716369450E-17 STO 6

More precisely, does anyone know if there exists a listing of these coefficients that show more digits?

I now have an emulator of the HP-38C (iPhone) that allows me to store constants of up to 15 or 16 digits, instead of 10 on the original machines. I've already taken care of the one in Reg 0 as I just took a 16 digit Pi and divided it by 180. My thinking is that if I can use longer coefficients I can probably get more accuracy. Although this program has a high degree of accuracy to begin with.


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Trigonometric Functions for the HP-38C/HP-12C - bshoring - 03-25-2016 03:30 AM

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