exponentaial curve fitting

[tom_z]

Hi,

  The exponentaial model for curve fitting in LabVIEW is y=a*exp(b*x). Is it possible to curve fit a model y=a-a*exp(b*-x). One example of this model is the voltage of the capacitor of a RC circuit when applied a DC voltage.

   Thanks for help!

   Tom

[altenbach · Accepted solution]

Yes, just use the generic nonlinear curve fit and write your own model. 😉

[tom_z]

Thanks! It works.

[Bandit]

Hi Altenbach & Tom_z

Very pleased to find this old discussion. Just what I needed to achieve on a project I am working on, and after reading this and a bit of effort on the model it works a treat.

One thought. This vi has two polymorphic methods, manually selected. You can either use the function model method or the function string method. I got the function model method working, but when I tried the function string method I couldn't make it work. Is it coincidence that all the examples use the function model method?

Best Regards,

Bandit.