33 Forensic?

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HP Forum Archive 14

33 Forensic?
Message #1 Posted by Arnaud Amiel on 20 Feb 2004, 4:07 a.m.

Would a nice owner of a shiny new 33s tell us what is in degrees DISP ALL.
9 SIN COS TAN ATAN ACOS ASIN
Thanks,
Arnaud

Re: 33 Forensic?
Message #2 Posted by Nenad (Croatia) on 20 Feb 2004, 8:32 a.m.,
in response to message #1 by Arnaud Amiel

Better:
9 SIN COS TAN ATAN ACOS ASIN 9 - EEX 6 *
The answer is in ppm error (as somebody once said)

33s Forensic Result: 8.99999986001
Message #3 Posted by Paul Brogger on 20 Feb 2004, 10:48 a.m.,
in response to message #1 by Arnaud Amiel

Chasing guard digits doesn't further refine the value above, which is available immediately via the SHOW feature.
I'd already reported this to Mike Sebastian.


Re: 33s Forensic Result: 8.99999986001
Message #4 Posted by Nelson M. Sicuro (Brazil) on 20 Feb 2004, 12:36 p.m.,
in response to message #3 by Paul Brogger

This means that they are using another algorithm, not only a Saturn CPU emulation on a newer CPU.
There is any way to measure its speed?
Try this on "Solve" (Algebrical TVM formula, please modify it where necessary):

(1+i)^n*pv+((1-(1+i)^n)/(1-(1+i)))*pmt+fv=0
This works on my HP-95LX with 16 digits precision:

n=31,536,000 i=1/315,360,000 pv=0 pmt=-0.01
calculate for fv.
Some results:
HP-95LX : 331,667.0056360354 HP-17BII: 331,661.800473
Internal TVM (take same i mult. by 100):
HP-95LX : 331,667.0066907769 HP-17BII: 331,667.006691 HP-10BII: 331,667,006691 HP-12C : 331,667,0067
(Example taken from MATHEMATICS WRITTEN IN SAND by W. Kahan)
Best regards,
Nelson

49g+ solver gets same as 17BII
Message #5 Posted by John on 20 Feb 2004, 2:50 p.m.,
in response to message #4 by Nelson M. Sicuro (Brazil)

The 49g+ equation solver gets the same result as the 17BII solver, 331,661.800473
The 49g+ financial solver is more accurate, returning 331,667.0067.

HP-95LX Solver precision
Message #6 Posted by Nelson M. Sicuro (Brazil) on 20 Feb 2004, 3:27 p.m.,
in response to message #5 by John

I think that the HP-95LX/200LX (and other HP palmtops) solvers in the "HP Calc" program is the most accurate solver that I knof of! It uses 16 digits (I don't know how much it uses internally) and the answer is even better than the HP-49G+...
BTW The 95LX "forensics" result is
9.000000000029575
Best regards,
Nelson

Edited: 20 Feb 2004, 3:31 p.m.

Re: 33s Forensic Result: 8.99999986001
Message #7 Posted by bill platt (les Estats Unis d'Amerique) on 20 Feb 2004, 3:08 p.m.,
in response to message #4 by Nelson M. Sicuro (Brazil)

32sii Equation editor:

Entered (1+i)^n*pv+((1-(1+i)^n)/(1-(1+i)))*pmt+fv as an expression, (checksum 41D6, 57.0 bytes)

and solved for fv: got 331,661.800473 (Same as 17bii and 95LX solvers)

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