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Re: calculate the area of a curve
Posted:
Mar 23, 2013 10:20 AM


On 3/23/2013 7:57 AM, angelina wrote: > Hi! > I am not sure if there is a way to calculate the area of a curve in matlab.
curve does not have an area. it is just a curved line. it has a length though and it has curvature, but area?
>What I want to do , is first , define the curve (which is a load duration >curve) and it is three piece linear.How can I define it? > The coordinates are (0,100) , (2.8,75) and (100,25) > Then , I want for the beginning to calculate the whole area af >the curve and after that for many straight lines of the form y=a I want >to calculate the area of the two areas that are created. > Any comment or help woould be of great importance! > Thanks a lot! >
It sounds like you want to integrate a function and you have only 3 points for it? May be you can look at trapz.
http://www.mathworks.com/help/matlab/ref/trapz.html
"Z = trapz(Y) computes an approximation of the integral of Y via the trapezoidal method"
good luck,
Nasser



