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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 Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by lanser[/i] [br]Hello. My question concerns the subject of nonlinear fitting of extremely large datasets (1D function with about 100 000 records in workbook). Origin help says that the method of Levenberg-Marquardt is used for this purpose. Does Origin use some preprocessing of large datasets (mostly functions to reduce the dataset) before the application of L-M? And if does, what is that algorithm? I will be very glad to obtain some references too. Thank in advance. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.