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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 kikzzz[/i] [br]Origin Ver: 9.1. Service Release: b215 Operating System: windows 8 64-bit I would like to use fitting function based on formula like this: [IMG]http://i58.tinypic.com/52htds.png[/IMG] How can I do it right? I tried define new nolinear fitting function: [IMG]http://i59.tinypic.com/2i8gfw4.png[/IMG] [IMG]http://i57.tinypic.com/34ha0b4.png[/IMG] [IMG]http://i57.tinypic.com/xqcm6p.png[/IMG] As a result, I received an abnormal curve. Where did I make a mistake? [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.