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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 nelsonnc[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): Operating System: OriginPro 2015 Hello- I need to curve fit by taking linear combinations of column data. That is, [(a)*(col(1))] + [(b)*col(2))], where a+b=1. This is very easy and straight forward in excel. However, I need to do this to large data sets and thus am looking to automate the task. Any help is appreciated. Thanks Nick [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.