Function y = 2*pi*1E-4*N*R^2/(R^2+(X-x)^2)^1.5 with parameter N,R,X
While use OriginPro 8.1SR2 with fitting Results N N R R X X Statistics Statistics Value Standard Error Value Standard Error Value Standard Error Reduced Chi-Sqr Adj. R-Square B 100.29584 0.25982 0.04674 1.65226E-4 0.05843 8.69031E-5 3.14061E-5 0.99982
But when fitting in OriginPro2017, it says that "Fit did not converge - mutual dependency exists between parameters."
It seems that you will need to use a different variable than X. I tested with replacing X with A in the equation. Afterwards I was able to get the fit to converge.
Thank you , it works now in 2017 Maybe X is system var, but the fitting passed in 8.1; Origin 2017 should give some hints that variable X,... is not preferred
Nonlinear Curve Fit in OriginPro 2017
Posted - 10/31/2017 : 09:26:35 AM
