All Forums  Origin Forum  Origin Forum  problem in Non linear curve fitting

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

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 Abbas1206[/i] [br]Hellow i am new to origin and need help regarding nonlinear curve fitting for user defined function. The model equation i am following is: ((P1*1.602e-19*P2)/(1+(P2*x)^2) +P3/(1+(P4*x)^2)+P5/(1+(P6*x)^2))/ (((P1*1.602e-19*P2)/(1+(P2*x)^2) +P3/(1+(P4*x)^2)+P5/(1+(P6*x)^2))^2 + ((P1*1.602e-19*P2)*P2*x/(1+(P2*x)^2) +P3*P4*x/(1+(P4*x)^2)+P5*P6*x/(1+(P6*x)^2))^2) P1,P2,P3,P4,P5,P6 are parameters i want to calculate. In model this equation fitt well but i face problem that peaks are ignored during fitting (equation cannot fit peaks). Model: [img]https://my.originlab.com/ftp/forum_and_kbase/Images/model1206.JPG[/img] My Fitting: [img]https://my.originlab.com/ftp/forum_and_kbase/Images/My fitting1206.JPG[/img] Thanks in advance Abbas [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.