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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 memez[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 8.6 Operating System: windows xp sp3 Hello everyone, I origin 8.6 trial version because I needed to perform a tricky fit for my "advanced physycs lab" course. The Aim is to find the 'A_d' and 'Theta_d' parameters (with the corresponding uncertainties) belonging to the following formula: [img]http://www.originlab.com/ftp/forum_and_kbase/Images/ro_d.jpg[/img] we have a complete set of 471 empirical data to match the rho_d (dipendent variable) and T. We watched closely the tutorial on how to make a fitting function that included an integral using lab talk ([url]http://www.originlab.com/www/helponline/origin/en/mergedProjects/Tutorial/Tutorial/Fitting_with_Integral_using_LabTalk_Function.html[/url]); when we tried implementing it the program said that the integration variable (x) was not declared. Then it could not even perform one iteration. Obviously we couldn't do any fit. Any guess why the function doesn't work? [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.