41C/CV root finders

[bshoring]

(05-21-2015 07:36 PM)Dieter Wrote:  Try the standard example:

  10 STO 01 (n)
  50 STO 03 (PV)
–30 STO 04 (PMT)
400 STO 05 (FV)

XEQ"I%" => 14,4359

The program evaluates a first guess of 9,8361% and finally returns 14,4359% after five iterations. With flag 01 set (BEGIN) the result is 10,2051%.

Dieter

Hi,
Just for fun, I tried out the "standard example" above on my financial calculators, HP-37E and 38C. Also tried on an emulator for the 12C. On each of these, if I tried to solve for "i" the display would show "Error 5" apparently for "illegal cash flows." However, if I plug in the interest rates you got, and solved for n, PV. PMT & FV, I get exactly the other values.

My HP-41CV is not working, so I couldn't try out the interest rate solver in the finance pac or in the PPC ROM.

I'm curious, has anyone tried out this example on either the Finance Pac or PPC ROM TVM programs on the HP-41 ? Does it yield the results shown above or does it give an error message?

Bob