## Basic Integration [ Integration limits ]

### sese (view profile)

on 19 Jul 2013

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

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### Wayne King (view profile)

on 19 Jul 2013
Edited by Wayne King

### Wayne King (view profile)

on 19 Jul 2013

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

### sese (view profile)

on 23 Jul 2013

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

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