New Blog Entry: Fun with the HP 12C
10-24-2014, 03:41 AM
Post: #1
 Eddie W. Shore Senior Member Posts: 1,236 Joined: Dec 2013
New Blog Entry: Fun with the HP 12C
10-24-2014, 05:03 PM
Post: #2
 Gene Moderator Posts: 1,198 Joined: Dec 2013
RE: New Blog Entry: Fun with the HP 12C
Great entry Eddie! Love to see the 12c working in all sorts of areas.

Consider sharing on your blog some of the game programs for the 12c found here too.

12c document
10-25-2014, 04:05 PM
Post: #3
 Thomas Klemm Senior Member Posts: 1,447 Joined: Dec 2013
RE: New Blog Entry: Fun with the HP 12C
More fun with the HP-12C: HP-12C’s Serendipitous Solver
10-25-2014, 04:15 PM
Post: #4
 d b Senior Member Posts: 489 Joined: Dec 2013
RE: New Blog Entry: Fun with the HP 12C
Valentin doesn't even need to sign his work. Tanquam ex ungue leonem.
10-28-2014, 02:06 AM
Post: #5
 Eddie W. Shore Senior Member Posts: 1,236 Joined: Dec 2013
RE: New Blog Entry: Fun with the HP 12C
Here is part II:

http://edspi31415.blogspot.com/2014/10/m...error.html
10-28-2014, 02:42 AM
Post: #6
 Jeff_Kearns Member Posts: 147 Joined: Dec 2013
RE: New Blog Entry: Fun with the HP 12C
10-28-2014, 03:41 AM
Post: #7
 Eddie W. Shore Senior Member Posts: 1,236 Joined: Dec 2013
RE: New Blog Entry: Fun with the HP 12C
Thank you so much guys! My next blog entry is a compilation featuring the three links suggested and two more: HP 12C Games and Black-Scholes.

10-28-2014, 04:45 AM (This post was last modified: 10-28-2014 06:13 AM by Thomas Klemm.)
Post: #8
 Thomas Klemm Senior Member Posts: 1,447 Joined: Dec 2013
RE: New Blog Entry: Fun with the HP 12C
Combining both of Valentin's ideas we can define the Taylor series of sin:

0 CF0
1 CFj
x<>y CFj x<>y
2 CHS ÷ 3 ÷ CFj
x<>y CFj x<>y
4 CHS ÷ 5 ÷ CFj
x<>y CFj x<>y
6 CHS ÷ 7 ÷ CFj
(...)
x<>y CFj x<>y
12 CHS ÷ 13 ÷ CFj

Then we can use this short program to calculate sin(x):
Code:
1/x 1 x<>y Δ% STO i NPV

Cheers
Thomas
10-28-2014, 10:31 PM
Post: #9
 Jeff_Kearns Member Posts: 147 Joined: Dec 2013
RE: New Blog Entry: Fun with the HP 12C
(10-28-2014 04:45 AM)Thomas Klemm Wrote:  Then we can use this short program to calculate sin(x):
Code:
1/x 1 x<>y Δ% STO i NPV

Thomas - There must be something missing in your code... It sure doesn't work for me, either by entering the angle in degrees or radians.

Jeff K
10-29-2014, 12:42 AM (This post was last modified: 10-29-2014 07:57 AM by Thomas Klemm.)
Post: #10
 Thomas Klemm Senior Member Posts: 1,447 Joined: Dec 2013
RE: New Blog Entry: Fun with the HP 12C
This is another way to enter the coefficients:

0 CF0
1 CFj
0 CFj
3 n! 1/x CHS CFj
0 CFj
5 n! 1/x CFj
0 CFj
7 n! 1/x CHS CFj
0 CFj
9 n! 1/x CFj
0 CFj
11 n! 1/x CHS CFj
0 CFj
13 n! 1/x CFj

You can use RCL CFj to check your entries. The index n will go down from 13 to 0. Just make sure to set n to 13 again!

This is the program as numeric codes:
Code:
01-     22 02-      1 03-     34 04-     24 05-  44 12 06-  42 13

These are some examples:

0.1 R/S
0.09983341665

0.2 R/S
0.1986693308

1 R/S
0.8414709848

3.141592654 ENTER 6 ÷
0.5235987757
R/S
0.5000000000

HTH
Thomas

PS: All angles are in radians.
Edit: Added a Nonpareil state file.

Attached File(s)
10-31-2014, 09:31 PM
Post: #11
 Thomas Klemm Senior Member Posts: 1,447 Joined: Dec 2013
RE: New Blog Entry: Fun with the HP 12C
With this program the function sin-1 can be calculated. Just use the same entries for the coefficients as before for sin.

Code:
01-     16   CHS 02-   44 0   STO 0 03-  42 15   IRR 04-      1   1 05-     34   x<>y 06-     25   % 07-     40   + 08-     22   1/x

Examples:

0.1 R/S
0.1001674212

0.2 R/S
0.2013579208

0.5 R/S
0.5235987756
6 ×
3.141592654

0.5 √x
0.7071067812
R/S
0.7853981632
4 ×
3.141592653

Cheers
Thomas
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