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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 susmitkumar[/i] [br]Hi, I am trying to fit the formula in the first picture to my magnetic susceptibility as a function of temperature data, but, I dont know how to use the summation in the NLfitting function in Origin. Can anyone help? [img]https://my.originlab.com/ftp/forum_and_kbase/Images/OriginForumQuestion.jpg[/img] I also have a question on calling Langevin function into a susceptibility formula as shown in image 2, but, I dont know how to do that either. Please help. [img]https://my.originlab.com/ftp/forum_and_kbase/Images/LangevinFunction_Origin.jpg[/img] Many thanks in advance. Kind regards Best regards, Susmit Kumar [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.