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levenberg marquardt fitting in 7.1

I am working with 7.1, and need to implement a nonlinear fit that is somewhat complex. Since the major part of the fit requires the adjustment of the parameters of a cubic spline, I would rather not try to put a cubic spline into the string formula of the VI.  Does anyone have some advice or a block diagram picture that I could look at to add, as part of the nonlinear fit, a call to VI that performs the cubic spline rather than trying to put this all into a string? Thanks in advance.


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Nevermind, I found what I was looking for on the board.

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