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Function fitting

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[quote][i]Originally posted by 66de250[/i]
[br]Dear Sirs,I need some assistance with a LabTalk script for nonlinear curve fitting.Below is my specific problem:
First, I have a user-defined function named ‘fuc’, which contains three parameters: "AA", "BB", and "CC". All three parameters have an initial value of '1'. Additionally, I have a dataset and a graph based on this data.
I need to implement the following using a LabTalk script:
Select a specific segment of the data in the graph (e.g., from the maximum value to the last value ) as the fitting range for nonlinear curve fitting.
Use the user-defined function file "fuc" as the fitting function.
Before each fitting, I need to change the initial value of parameter "CC".
Fit until convergence (when I manually operate, I find that may need click the "fit until convergence" button multiple times results in a correct fit, so in the script you need to consider how to ensure the fitting result is correct).
After convergence, I need to extract the fitted parameter "CC" and save it directly into a new worksheet at the i-th row and j-th column.
Could you provide me with a specific LabTalk code to solve this? Thank you very much!
[/quote]

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T O P I C R E V I E W
66de250	Posted - 10/28/2024 : 1:07:12 PM Dear Sirs,I need some assistance with a LabTalk script for nonlinear curve fitting.Below is my specific problem: First, I have a user-defined function named ‘fuc’, which contains three parameters: "AA", "BB", and "CC". All three parameters have an initial value of '1'. Additionally, I have a dataset and a graph based on this data. I need to implement the following using a LabTalk script: Select a specific segment of the data in the graph (e.g., from the maximum value to the last value ) as the fitting range for nonlinear curve fitting. Use the user-defined function file "fuc" as the fitting function. Before each fitting, I need to change the initial value of parameter "CC". Fit until convergence (when I manually operate, I find that may need click the "fit until convergence" button multiple times results in a correct fit, so in the script you need to consider how to ensure the fitting result is correct). After convergence, I need to extract the fitted parameter "CC" and save it directly into a new worksheet at the i-th row and j-th column. Could you provide me with a specific LabTalk code to solve this? Thank you very much!
1 L A T E S T R E P L I E S (Newest First)
YimingChen	Posted - 10/28/2024 : 3:00:45 PM Please check the following sample script to use the ExpDec1 fitting function to fit the sample data, and save the fitted parameter t1 to a new workbook. You may want to refer to the Labtalk Help page of nonlinear curve fitting: https://www.originlab.com/doc/LabTalk/guide/Non-linear-Fitting newbook; wbook.dc.add("CSV"); wks.dc.source$=System.path.program$+"Samples\Curve Fitting\Gaussian.dat"; wks.dc.import(); int istart = list(max(Col(B)), Col(B)); // get the index of max y value nlbegin iy:=(1,2)[istart:end] func:=ExpDec1 nltree:=ParamTree; ParamTree.t1 = 5; nlfit; newbook; Cell(1,1) = ParamTree.t1; James

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