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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 rainbowkoala[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 8.5.0 SR1 Operating System: win7 Hello, I hope you can help me with the following problem: I want to define an Origin C fitting function which involves three integral. For example, y=integ(A1+B1x)+integ(A2+B2x)+integ(A3+B3x) Lower Limit: -inf, Upper Limit: inf, integration variable: x, Parameters: A1/B1/A2/B2/A3/B3 I looked for the Origin help. But Origin allows user to define an Origin C fitting function which involves only one integral. http://wiki.originlab.com/~originla/howto/index.php?title=Tutorial:Fitting_with_Integral_using_LabTalk_Function Thanks for your help. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.