PPC Journal V2N6 - TVM i% unknown on HP-65

[Dieter]

(10-15-2015 04:54 PM)AndiGer Wrote:  I just now ran the program only with basic values. The result given was correct.
N=5
PMT=500 (Ordinary Annuity - "End")
PV=0
FV=-3000
Result I%=9,12806

Fine. How many iterations were required?
I did a quick and dirty test on an HP41 and convergence was quite slow.

Did the program also return the correct value for BEG mode (flag 1 set)?
This should yield 6,14024%.

I also tried a different algorithm with a usual Newton iteration with quadratic convergence, and the result was returned after 4 resp. 3 iterations.

BTW, does this program use the same sign convention for PV, PMT and FV as later HPs or is it different in this regard?

Dieter