Hello..

Has anyone ever used Origin (or even Excel) to fit data to a non linear curve? I've spent over an hour already trawling through various 'help' files and I'm none the wiser... The function I'm trying to fit the data to is :

θ(t)=K'[1-exp(-kt)]

'θ' here is my dependent variable, t is independent.

Any ideas? :confused:

Not used origin, but you can rig excel up to fit almost any function imaginable provided you have the "Solver" add-in installed - you know if you have that?