Need help fiutting curve nonlinear

So I have to develop a non-linear editing program to adapt to our experimental data. At frist I was not sure of the instances I have to use: either vi or the string one. I decided the vi version after looking through the previous posts on this forum. Because I didn't know how to select the settings, I had a look at the vi that has been discussed in this thread and used as a model of what I might need to do.

However I encountered a problem. I get the following error:

Error-20041 occurred at NI_Gmath.lvlib:Nonlinear Curve Fit LM.vi:5

Possible reasons:

Analysis: The system of equations can be solved because the input matrix is singular.

I can't work out why I get this error in the vi trendline. Also if I may continue execution of vi, the values in the best now fair adjustment settings match those in the initial adjustment settings. The settings I used are close enough well-known figures (ie those I used to calculate my "data"), and they were chosen as default values.

Any help on this would be appreciated. I enclose 3 vi. One is the vi, another fitting fitting function and the third is a vi for the weight. The I'm trying to adapt is given in the fitting function vi. The equation to calculate the weight is given in weight vi. I should also mention that the data that I have attached are not my actual experience (where my calling fake data), but it's typical of the kind of data I get. I've included some header information in this data file as the style data will come, is the location of the data columns (have only filled the appropriate columns of data for the purpose of the development of the Installer).

I'm using Labview 8.6.

I think that your units are all stripped!

You would get a perfect fit if you make the following two changes:

  • do not wire the weight! (you must first adjust units!)
  • Change the model function to divide the result by ~ 4th-21 (see image) there is probably a specific factor that can be determined from first principles. I don't mind, because I don't know what the model is all about. .

Here is an example with a little off from values (Data - Fit is much less than 1%):

Tags: NI Software

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