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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 espenhjo[/i] [br]Hi, I have Origin 7.5 SP2 with the NMR addon. Now I can't define my own functions in NLSF. When I try to use the funciton I get the message: Error 28037. Likely caused by errors in user defined formula or poor parameter initialization. And, this is not the case! I plot an exponential function y=P1+exp(P2/x)and then define a function in NLSF that is similar to that. Then I try to fit my dataset with this function. NLSF then makes a good fit, and gives the correct parameters, but at the end of each iteration I get the error message, and there are no error margins or dependencies for the parameters. The built in functions work normally. Espen Johannessen Edited by - espenhjo on 05/18/2004 05:41:42 AM [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.