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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 nixusminimax[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin):8.1 Operating System:xp Hello Today I used origin for the first time, so I am unable to solve my task via LabTalk programming on my own. Task: Define an Value on the x-axis as the beginning of an intervall with a certain length if the value of y decreases by a certain amount. Determine the average increase ( first derivative) for three consecutive values these values are still two values prior to the beginning of the intervall. Example. The Beginning of an Intervall was defined as the thenth value (x10,y10). Hence the average increase (first derivation) from (x5,y5) till (x7,y7) , is of interest. At first I generate a Line Plot and used math tool to create the first derivation for all values (x,y). Any idea [url][/url][url][/url][url][/url][img]http://www.originlab.com/ftp/forum_and_kbase/Images/78graphzahn84.bmp[/img] [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.