TVM solve for interest rate, revisited

[jonmoore]

Hi Albert, I've been attempting to follow the thread and am presuming that it serves as a communication channel with Thomas ref your ongoing optimisation of the TVM solver in Plus42? The reason I ask is that I noticed you're prototyping with both XCAS and bespoke Lua code. I know KhiCAS on the Nspire can work with the Nspire's Lua interface, so I wondered if that's what you're doing, or is Thomas using Lua as part of the toolset in Plus42?

No real purpose to my enquiry, I'm just interested in the flow of your problem-solving.