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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 AlexClark[/i] [br]Origin Ver. 8.5.1 Windows 7 Hi everyone. Sorry if this is a repetition on a previous post - I searched but couldn't find my problem. I am currently trying to define and save a fitting function. It is a long polynomial, but won't work in the standard expression window. I have therefore tried the Origin C option. I have tried defining and saving the function many times. It gets to the point where I compile and I can also use the quick check which gives me the correct result, so I know the function works. I then continue and save but then it won't let me select my user defined function when applying the fit. I just get the error "external call execution error" in the script window. Any ideas what is going wrong? Any help much appreciated. Alex [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.