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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 nilabja454sarkar[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): Operating System:Origin Pro 9.0 SR1 Hello, Please help me with the following problem: I want to fit the following equation with my data using Origin C fitting function 𝑌=−6/𝜋^2 ∗𝛼∗∫[𝑥∗𝑒^𝑥/(𝑒^𝑥+1)^2 ∗𝑑𝑥/𝑑𝑡]𝑑𝑦 ; Where 𝑥=𝛼/𝑡 √({tanh⁡[1.837(1/𝑡−1)^0.51 ] }^2+𝑦^2 ) Lower Limit: 0, Upper Limit: inf. Here 𝛼 is the only fit parameter. Please, note that‘t’ is the independent variable and but the integral is with respect to ‘y’. Nilabja Kanti Sarkar [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.