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Author Message   gehong (gehong518) Junior Member Username: gehong518 Post Number: 3 Registered: 12-2006 Posted on Sunday, March 25, 2007 - 05:36 am:    Hello! Robert G. Nelson I want to calculate the average value. Now I have a group of data about a variable [Voltage(x,y)]in X-Y plane . I don't know how to calculate the average of voltage. Please help me! How can I get the average of voltage?   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 795 Registered: 06-2003 Posted on Sunday, March 25, 2007 - 01:10 pm:    INTEGRAL(V)/INTEGRAL(1) The numerator is the area integral of V, and the denominator is the area. You can include a weighting function if you want: INTEGRAL(W*V)/INTEGRAL(W) (W is an arbitrary space-dependent function).   gehong (gehong518) Member Username: gehong518 Post Number: 4 Registered: 12-2006 Posted on Sunday, March 25, 2007 - 09:20 pm:    Thank you! Mr Robert