Adjustment of the integral of a Gaussian

Hello

I have LabView 2013 I'm trying to curve adjusted using the non-linear curve Lev - Mar vi but are unsure how to proceed. From what I understand, you can create a user defined model in the string, but the help files only detail a the second order polynomial of the form a1 + a2 * x + a3 * x ^ 2.

I have the intensity of the reflection of the laser on a sample of data, and when the laser moves on the metal marker intensity increases. The metal marker has a beginning of knife edge and increase intensity moving on the marker shows Gaussian beam shape and intensity profile can be described using the integral of the Gaussian shape.

Sorry if this problem has been posted before, but I can't see it in the forums in general pretty average I can understand as a new user. I basically want to model defined by the user of the integral of a Gaussian type and feed my data in the form (x i) and give it me the coefficients I can take the center point as the tip of the marker position.

Thank you

Paul.

OK, I have a comment on the Code and comment on the data.  First, the code.  You use a 'chain of the formula', which means that you ask LabVIEW to claim that it is Matlab and can 'interpret' a channel to follow the instructions as you want.  It would surprise me a lot if it worked, especially with something other than the simple polynomials.  Since it is LabVIEW () and write a VI to calculate F(x, a) and explicitly put in the square root and the erf functions you need.

In looking at the data, I confess that I don't know what you're trying to mount.  I see a number of pulses noisy square wave what-look-like in X and Y, there does not at the same time.  I'm guessing that you are interested in fitting something in the transition - why not seek 'big first derivatives' and she (for example), find the middle between high and low?  If you need more sophisticated features of fitting, you could at least narrow down the set of data that you send to your function of fitting to include a small subset of points surrounding the transition.

Bob Schor

Tags: NI Software

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