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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 00S[/i] [br]Origin Ver. and Service Release: 7.5G SR6 Operating System: Win XP Dear Origin users, I would like to measure a volume which is an irregular shape immerged into a plane or spherical surface (wear scar of a "pin on disk" experiment). I have a z=f(x,y)-matrix of the wear scar and the remaining surrounding original surface. If I can compute a new matrix which just has the original surface (plane, sphere), I would be able to substract it from my actual data and get the wear scar surface being leveled at z=0. Then I could just add up my delta-matrix values and and multiply with dx*dy and have my volume. My problems are: 1) The surounding surface is not flat but slightly rough, therefore I cannot set up a plane-function with any 3 points or a sphere-function with any 4 points. I need something to have a good fit of the plane/sphere to the surrounding area. (Is there a way I can use the non-linear curve fit function for z=f(x,y) functions?) 2) Can I substract and add different matrices in origin? How do I add up all values? (= Is there a way around learning the script laguage;-) ) If anybody has an idea how to solve this problem, maybe even using a completly different apporach, I highly appreciate any input. I have not worked too much with Origin yet but would get deeper into it if I know what I have to look for. Thanks in advance, Stefan [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.