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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 jmorisen[/i] [br]Origin Version (Select Help-->About Origin): 7.5 Operating System:XP Hello! My problem is with the non-linear curve fitting : I have defined a new function successfully,but i would like Origin compute my function in Log. I've tried to do this directly,for exemple y=(a*b)^n become log(y)=n*log(a*b), but the program can not compile it. Thanks [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.