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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Forum: LabTalk Forum Subject: Message: * HTML is OFF * Forum Code is ON Smilies 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!   Check here to subscribe to this topic.