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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 Josh3501[/i] [br]Hi, I'm new to Origin. I am trying to use the non-linear curve fitting function to some displacement/time experimental data to acquire some unknown parameters about the tested material. Similar has been done in a past paper. However, I am unsure if I am going about the process in the right way as I am getting ridiculous values. Any help would be appreciated. [img]http://www.originlab.com/ftp/forum_and_kbase/Images/VEPmodel.jpg[/img] The above equations is the full model that the experimental data needs to be fit to. Everything is known apart from E',H and Nq. These are the values that I want. Function type: Equations [img]http://www.originlab.com/ftp/forum_and_kbase/Images/VEPmodel2.jpg[/img] [img]http://www.originlab.com/ftp/forum_and_kbase/Images/VEPmodel3.jpg[/img] Is this the right way to go about this ? josh [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.