41C/CV root finders

[Ángel Martin]

(05-24-2015 07:10 PM)Dieter Wrote:  Ángel, how does your MCODE version behave if there is no solution? Does it loop forever, did you provide an iteration counter, or what will happen? And – please excuse my dumb question – is MCODE interruptable by the user?

You may try the standard example (n=10, PV=50, PMT=–30, FV=400) with n=8 or less. In this case no solution exists.

Yes it is interruptible (the code checks for a key press event) but no, there is no counter due to available space restriction (it is also in the SandMath, which was very crowded already). So the example above just keeps iterating until the user stops it. Not perfect, but then... who said "the better is the enemy of the good"?

As to whether there are missing terms in the formula for the derivative, well I hope not; barring a sinister transcription error that's the expression used in the code. I'll double check my notes.

Cheers,
'AM