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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 TobiasF[/i] [br]Origin Version (Select Help-->About Origin): 7.5886 Operating System: Win XP SP2 I have a 2D graph with logarithmic scaling (log10) on the x and y axis. Then I have two datasets with some x and y data (minimum 2 data pairs, maximum 4 data pairs). As next I want to create a linear fitting so that I will get a straight line in the graph. The result should be similar to the result as if I select the dataset in the graph by hand and make an “Analysis -> fit linear”. But I’m beginner and do not know which function I have to use in C. My datasets are named: Dataset dsCx("Calc1_A); Dataset dsCy("Calc1_B); Thanks Tobias [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.