HP-12C Platinum keystrokes:

9

R/S

g GTO 090 R/S

g GTO 100 R/S

g GTO 178 R/S

g GTO 157 R/S

g GTO 137 R/S

HP-15C keystrokes:

9

SIN

COS

TAN

g TAN-¹

g COS-¹

g SIN-¹

More information and instructions

here.

Link to HP Emulators, including the HP 12c Virtual Calculator:

http://www.calculatrices-hp.com/index.ph...emulateurs (Thanks, Franz!)

Steps 277 through 399 are optional and can be deleted if necessary (in this case change line 268 to GTO 000).

12C_Platinum_Trigs.zip: Same as the US (THEM?:-) version, except that DECIMAL POINT IS COMMA.

(01-26-2015 09:07 AM)EdS2 Wrote: [ -> ]How do these trig functions compare to Valentin Albillo's?

(http://www.hpcc.org/datafile/hp12/12c_Tr...ctions.pdf)

Fast and Accurate Trigonometric Functions on the HP-12C Platinum
- Angle modes (DEG, RAD, GRAD);

- The stack register Y is preserved;

- Wider input range while keeping the same accuracy (SIN, COS, TAN: |x| < 1E12 degrees);

- All functions are computed independently;

- Mostly fixed execution times regardless of the arguments;

- More accurate results (mainly because the HP 12c Platinum doesn't round intermediate results to 10 digits);

- Faster method (Minimax polynomial rather than Taylor series);

- At least 276 steps long, plus 15 registers;

- It works on the HP 12c Platinum only.

Valentin was limited to only 99 steps however, so his achievement is quite remarkable. I wonder what he could have done with four times more programming steps! (He would never need that much, in the first place).

Regards,

Gerson.

Thanks! Just the degrees mode could be a crucial advantage.