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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 Mia12[/i] [br]Please help. I am using latest version origin-Lab. I wanted to fit black body equation and hence to find the temperature from it. I put parameters h, c, k, t. I kept all parameter constant except t (temperature). File did not convert unknown reason. this is the user defined function. y=((2*h*c^2)/x^5)*(1/(exp(h*c/(x*k*t))-1)) Mia[img]https://my.originlab.com/ftp/forum_and_kbase/Images/fgf.PNG[/img] [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.