41C/CV root finders
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05-27-2015, 11:16 PM
(This post was last modified: 05-27-2015 11:40 PM by Dieter.)
Post: #28
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RE: 41C/CV root finders
(05-27-2015 10:09 PM)bshoring Wrote: 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. Yes, the example is not trivial. Both PV and FV are positive, so that there are two possible solutions for the interest rate – or possibly no solution at all. ;-) (05-27-2015 10:09 PM)bshoring Wrote: 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 just tried V41 with the TVM function of the Advantage Pac. Result: "$ERROR". #-) Maybe this is HP's way of telling the user that this TVM scenario is not trivial and may have no or multiple solutions. Or maybe in their opinion it doesn't make much sense financially, although there is a mathematical solution (resp. even two). Dieter |
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