Back to main page |
**Email me at:**
Gene!

The program presented below will calculate the Hyperbolic Trig functions (Sinh, Cosh, Tanh) on the HP-25. It was written by James Davidson and appeared in the V3N5P11 issue of the PPC Journal (May 1976). Thanks to James!

This program definately DOES violate my stated objectives for putting programs on my page. Why is it here then? Because the programming technique James used deserves to be seen.

This program is called self-selecting because of how you use it.

You key in the angle you need, then perform the corresponding normal trig function on the angle, then press R/S. The program determines which normal trig function you performed and performs the complementary hyperbolic trig function. Quite neat, actually!

**Examples: ** 1) Find the Sinh of 10 degrees: 10, f SIN, R/S. Display shows 11013.233. 2) Find the Cosh of 5 degrees: 5, f COS, R/S. Display shows 74.209949. 3) Find the Tanh of 0.867 degrees: 0.867, f TAN, R/S. Display shows 0.699847.

Line Instruction Keycode 01 f LASTX 14 73 02 f SIN 14 04 03 f X = Y 14 71 04 GTO 21 13 21 05 RDN 22 06 f LASTX 14 73 07 COS 14 05 08 f X = Y 14 71 09 GTO 28 13 28 10 f LASTX 14 73 11 g e^x 15 07 12 g x^2 15 02 13 1 01 14 - 41 15 ENTER 31 16 ENTER 31 17 2 02 18 + 51 19 / 71 20 GTO 00 13 00 21 f LASTX 14 73 22 g e^x 15 07 23 ENTER 31 24 g 1/X 15 22 25 - 41 26 2 02 27 GTO 19 13 19 28 f LASTX 14 73 29 g e^x 15 07 30 ENTER 31 31 g 1/X 15 22 32 + 51 33 GTO 26 13 26

That's it!

Visitors since 8/5/97