Basic Integration [ Integration limits ]

Question

sese 2013-7-19

Hello Guys

Just i am wondering how to solve an integration problem in MATLAB for this equation?? here is the problem below

a= 3.43 int Q*n dr

where n dependent variable on r

Regards

Answer 1

Wayne King 2013-7-19

编辑：Wayne King 2013-7-19

Is Q a constant? I'm assuming you mean that n is function of r, like n(r)

Suppose n(r) = r^2 and you want to integrate from [-2,2]

integral(@(r) r.^2,-2,2)

If you don't have a version of MATLAB with integral(), you have options like trapz()

    r = -2:0.02:2;
    n = r.^2;
    trapz(r,n)

sese 2013-7-23

编辑：sese 2013-7-23

Q is not constant by the way and the integration is undefined.

Q=a*b; b=X^R; R=10; b=c*r; c=0.801; r=0.1;

BY the way, i have a MATLAB version :) Thank you