All Forums  Origin Forum  Origin Forum  Determination of onset - extrapolation/intersect

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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 PolisTyrol[/i] [br]Origin Ver. and Service Release: 9.0.0G (64-bit) SR1 Operating System: Windows 7 Dear all, I have data looking more or less like that: 1 50,0 2 47,5 3 45,1 4 42,9 5 40,7 6 38,7 7 36,8 8 31,0 9 24,4 10 17,1 11 12,0 12 8,4 13 5,9 14 4,1 15 2,9 If viewed with logarithmic y-scale, one can clearly see two regions of different slopes. In this example, its easy to determine the border between those two regions ("onset"), but there are other examples where it's more difficult. The best way to determine the onset is to approximate both regions by a linear line (linear in the logarithmic scale) and to find the intersect of those two lines. So far I do it manually, but I would much prefer to create an automatism. It would be easy in Matlab, but is there also a way in Origin? Regards, Polis [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.