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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 aeolian1[/i] [br]Origin Version (Select Help-->About Origin): 6.1 Operating System: XP Hello, I looked through related topics on the Forum, but couldn't find a recent answer that detailed the exact syntax I need: I would like to simultaneously fit one data set to one fit function and a second data set to a second fit function, with 5 parameters shared between the functions. That is, I have a data set (x1,y1) which should be fitted to function f1, and a data set (x2,y2) which should be fitted to function f2, with parameters P1-P5 all shared; the x-values in each data set are totally different. Could you please tell me the *exact* syntax for defining such a "fitting conglomerate"? In the function definition section, I tried using User-def. param. names: W1, W2, W3, W4, W5 Indep. variables: x1, x2 Dependent variables: y1, y2 Under the "form" I selected "Equations" and typed in the following function definitions: y1 = f1(x1, W1, W2, W3, W4, W5); y2 = f2(x2, W1, W2, W3, W4, W5) but this gave the error "Function definition is incorrect." Could you please tell me where I am going astray? Thank you very much!! P.S. (not as urgent a question) I noticed a while back that once Origin generates more than 99 simulated curves of the type "nlsf_b", things seem to go haywire (and that deleting the generated curves doesn't help, since Origin keeps numbering sequentially). Wondering along the same lines, will I have a problem once I try to define user100? I currently have 90-some user-defined functions, so this will happen soon; unfortunately, I need all of these functions... [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.