how to calculate the area under a plot? when I use the area option, I'm not getting a satisfactory value. someone pls help me.

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Aiswaria 2013-5-8

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the program is attatched herewith clear all; clc; t=0:0.1:2.4; %total no. of points f=1./t fs=10; %sampling frequency y=xlsread('f1 15 th new.xlsx','sheet1','L6:L29'); %original function in time Y=fft(y); %convert to Freq domain plot(f,abs(Y),'r'); a=area(f,2*abs(Y)); a

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Answer 1

Matt Kindig 2013-5-8

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This isn't what the area() function does. The area function plots a filled shape below the line that is passed into it. The graphics handle to the shape is returned by the function, which is unrelated to the "area" of your curve.

Use trapz() instead.

doc trapz