power fit VI

[GlenS]

I'm using the Power Fit VI and getting some strange results.  When I pass the VI arrays that go through the y-axis the VI return NaN for all outputs.  If the data starts at x=1 then it's fine.  Can anyone tell me why this is?

[altenbach]

Unless the power is a positive integer, x must be positive, otherwise x^y is not defined (unless x is complex).

This means that the power fit only works for positive x.