multiple gaussian peak fitting

[abs]

I have LabVIEW 7.5 How do I fit multiple gaussian peak (amplitude) with Labview. Is there a package to do this or do I have to start from scratch.

Thanks

[altenbach]

I don't think there is a LabVIEW 7.5.

Fitting multiple peaks is necessarily ambiguous because there will always be multiple solutions (e.g. swap all parameters of two peaks and you'get an equally good fit). It will be important to have good initial guesses.

An amplitude alone does not define a gaussian peak, each peak also has a position and width so you'll have to fit three parameters per peak. Is the number of peaks fixed or can it be variable? Do all have the same width?

The nonlinear fitting VIs have been extensively revised with LabVIEW 8.0. Doing the same in LabVIEW 7.x would involve quite a bit more work. LAbVIEW 8.0+ even includes an example that demonstrates fitting a function that is the sum of three gaussian peaks plus an offset.  :)That example would be a good starting point for you.

[johnsold]

Someone at NI Week (Greg?) said that LV7.5 was a special version used to develop the LEGO Mindstorms NXT software. The indication was that it was never released as an official LV product.

Lynn

[abs]

Thanks for both replies. My LV version is 7.1 and sorry for the mistake. I am trying to get LV 8 so that I dont have to go through hard programming. I'll keep posted of my progress.
Thanks