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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 OwlPl[/i] [br]Origin Version (Select Help-->About Origin): 8.0724 Operating System: WinXP First of all, hello everyone, this is my first topic here, hope I can count on your help. Excuse me for any spellin/related mistakes, I'm not a native speaker Let's get to the point. I need to count the area limited by a function. I tried using the "integ2" command, following what I read in the help file. I've got a series of data and I've created a chart and aproximated the data with a polynominal (shown on the Excel screen print). I insert that data (formula) into the Matrix (set vaulues - ctrl+c: -6E+08x6 + 3E+06x5 + 998124x4 + 1732,1x3 - 436,45x2 - 24,541x + 16,053) and integrate. I get integration value "1300,3" for the polynominal. And the question is - is that correct? Seems quite good, but does the software integrate the "whole" area (limited by the oX axis (y=0)) or (preferably) the area limited by the polynominal and y=ax+b which connects two extreme points? If not, how do I do that? [URL][img]http://img156.imageshack.us/img156/8976/wykresif1.jpg[/img][/URL] I hope I explained it properly ;) thanks in advance Mike [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.