Non-Linear Fitting VI Issues - LV 2017

[tmbates12]

No matter what I try after making a VI to define f(x, a) for my nonlinear fit, for some reason I keep getting a class mismatch between the reference and the input on the Nonlinear Curve Fit VI. I was wondering if this was an issue with my VI even though the connections all seem to be correct.

[altenbach · Accepted solution]

You changed the output connector for the derivatives. Even if not connected, it needs to be a 2D array (you made it a 1D array for some reason).

 

If you still have problems, feel free to attach the caller too.

Also, if you use a static reference, make sure to make it strictly typed.