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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 LabTalkNewbie[/i] [br]Origin Ver. and Service Release: 8Pro, SR4 Operating System: XP Hi! I have five coloums in my worksheet: A(X), B(Y), C(X), D(Y) with experimental data within. In the fifth coloum I want to have the sum of B and D, that means i want to add up two datasets. My Problem is now that it is not possible to add linewise, because the x-columns are not identical, e.g. A(X) runs from 10 to 20 (steps: 1), but C(X) from 12.5 to 22.5(steps: 1)! Is there any elegant possibility to do this? Because the data points are not precisely known, linear interpolation would be fine... Best regards, Mathias [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.