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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 Biotec12[/i] [br]Origin Ver. OriginPro 8.6.0 (64-bit) Sr3 serial number: SF8T5-3089-7902432 Operating system: Windows terminal server Dear All, I am trying to fit data with a function of the following form Independent Variable is F Dependent Variable is x Parameters are L,k,m,a if(x<a) F = 0; else x = function(L,m,k;F)+a; 1. This dose not work for positive "a" I have no clue why. 2. I can fit x = function(L,m,k;F) to the part of my data but when I am introducing above mentioned fitting function with "if (x<a)...." I am not able to fit whole data. I included an image how date may looks like. [url]http://www.originlab.com/ftp/forum_and_kbase/Images/Example for Origin.pdf[/url][img]http://www.originlab.com/ftp/forum_and_kbase/Images/Example for Origin 2.jpg[/img] [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.