how to use the parameter "data" in the vi of Nonlinear Curve Fit

[hilary]

I used "Nonlinear Curve Fit" to do state estimation. If I make the number of unknows a constant number, it is fine to code the fitting model for f(x,a). But if I want to code the number of unknows as a variable, how can I do this?

Maybe "data" should be used here. But I just could not find any examples talking about how to use "data" here.

Thanks.

[bburress]

Hey hilary,
    Have you looked at the LabVIEW help for the Nonlinear Curve Fit VI?  Which version of LabVIEW are you using?  In mine, the VI is polymorphic, and you can declare the formula to be a formula string.  Then it provides pins to enter the input parameters programmatically.  Perhaps you could post a screenshot of how you are currently using the VI, and we could help more.