41C/CV root finders

[Dieter]

(05-29-2015 06:44 PM)Ángel Martin Wrote:  ...but you're welcome to improve the method any time ;-)

There actually is another potential improvement: PMT=0 currently is not handled separately. At least the "Running..." display appears for several seconds on V41, and "impossible cases" like both PV and FV being positive seem to loop forever.

In a FOCAL program I would implement the direct calculation for PMT=0 this way:

Code:

RCL 03
RCL 05
+
CHS
RCL 03
/
ln1+x
RCL 01
/
e^x-1
100
*

Sometimes one forgets the most simple solution. ;-)

Dieter