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[Csaba Tizedes]

(03-02-2020 08:58 AM)Pekis Wrote:  Hello,

A nice little programmable (390 steps) from CASIO: fx-3650P II

… Very limited programming capabilities (no subroutines, only 7 variables)

Solving X² - 3 = 0 can be easily implemented as:
? → X : Lbl 1 : X - ( X² - 3 ) ÷ d/dX( X² - 3, X ) → X ◢ Goto 1

Yes, hard to decide which is better: the 3650P has differential and integral function, but only 390 steps available, but the fx-50FH has 680 steps with no these numerical calculus functions. Both of them really limited, but there are little tricks to improve these capabilities, eg. how to use stat registers to increase the number of storage space (this program use ALL registers to store CFs, but use the stat regs and Ans for looping and calculating NPV and iterating IRR):





A very accurate Sunrise/Noon/Sunset program - you can see a little analemma curve installed inside the hard cover for calculating anywhere, anytime, eg. during a hiking:

Youtube video

With fx-3650P you can write (I know, because I wrote) a little solver and with the d/dx() and integrate you can solve any root finding, extremum finding and integral range finding (eg. z-score statistics) and separable differential equation solver with these calculators (and yes, this is accurate because of the implemented integral routine).

Csaba