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hi guys,

out of interest (ha!) i started looking into the computational problems underlying tvm calculations. getting correct answers isnt just a matter of plugging numbers into textbook formulae. which is why most (non-hp), so called, financial calculators get wrong answers except in straightforward cases.

the 12c and later models like 17bii/19bii have proven themselves stable in acquiring correct answers and i know there are still some discrepancies with results from the new 12cp.

anyway, the idea was to investigate some of the algorithms used and try to replicate correct answers. i wrote up some findings here; http://www.voidware.com/tvm.htm

any more ideas most welcome,

happy new year,
-- hugh.