Multiple Curve Fitting Program HP-41

[Dieter]

(01-12-2018 04:54 PM)Graan Wrote:  I was just thinking to do some simple curvfit since I use to do it in excel for different sensors like NTC resistors etc. connected to microcontrollers. Namirs program seems quite advance. I just need to analyze say 10 to 15 X Y values.
Looking at Colbs program it seems not that hard to translate to HP42 code.
Im not familiar to curvfit theory just a user.

Maybe you should now explain what exactly you are looking for. The term "multiple" in your subject line is a bit misleading here.

If you say you have only X and Y-values you are obviously NOT looking for a program that does a multiple (sic!) linear regression. The latter means that the result is a linear combination of multiple independent variables, i.e. y = a + b·x1 + c·x2 + d·x3 + ...

So it looks like you need a program that calculates multiple styles of regression functions, e.g. linear, logarithmic, an exponential or power function, etc. Such a program is included in the HP-41 Standard Applications booklet that comes with the calculator. And it is also listed on this website (but without documentation and instructions).

Dieter