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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 trenk95[/i] [br]Hi together, i have some temperature data and i would like to determine the start of a freezing period and its end. With a filter x<0 i only get negative values but no period. I think it should work with some if clauses where the start of the period is defined as [if < 0 and previous value >0] and the end as [if > 0 and previous value <0] so the switch from positive - negative - positive can be presented. After that i also need the datetime and the duration of the period. But i've no idea how it can be solved with Origin. Thank you for your help. ST [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.