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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 rjt211[/i] [br]I'm trying to compare data (collected using several different sensors) for which I have temperatures for a specific timestamp (dd/mm/yy HH:mm:ss) but I really need to be able to plot them against a third variable - z-height. As you can see, I can correlate the z-height to a specific timestamp but I can't work out how to plot the z-height against temperature as the timestamp is different for each set of temperatures. [img]http://www.originlab.com/ftp/forum_and_kbase/Images/timestamp-numeric.JPG[/img] Any idea on how to convert the timestamp to a z-height or something? I tried plotting a graph of timestamp against z-height and using the equation to convert the timestamp but presumably because the timestamp is a very specific format and not a regular number I confused something. (Mostly myself.) Origin Ver. and Service Release: OriginPro 2016 (Student version) b9.3.2.303 Operating System: Windows 8.1 [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.