Adapting 'Accurate' TVM routine on HP-15C (and HP-34C) using MISO Technique

[Jeff_Kearns]

Thomas,

Where did you get your figures for the 15C? They do not match my results.

Quote:A Penny for your Thoughts.
Enter data:
n := 60*60*24*365 = 31,536,000 sec. per year.
i := 10/n = 0.000 000 317 097 9198 % per sec.
PV := 0
PMT := -0.01 = one cent per sec. to the bank.

Calculators FV displayed
~~~~~~~~~~~ ~~~~~~~~~~~~
27, 92, 37, 38, 12 331,667.0067
15 331,667.0081

As for the A Penny for your Thoughts example, both the 15C 'Classic' and LE (with the above TVM routine) give FV = 331,667,0070 - accurate to 9 significant digits and off by -0.000 000 090%. By comparison, the 32sii and 35s both give FV= 331,667.0067.

Neither the 15C LE nor the 15C Classic are capable of calculating the i%. The 15C LE flashes 3.015... E 94 and the Classic went on for 20 minutes before I stopped it.

In the case of the Yield from a Risky Investment example, both the 15C LE and Classic models gave the correct true i% (although the correct numbers will flash in the LE display if one does not provide a suitable initial guess for i% in register 2). The 32sii gives the correct result for i% in all cases.

The 'riot' vs 'not' typo in the 32sii manual only seems to have crept in in edition 5. Edition 4 is correct.

Jeff