Kindly help me integrate this function.

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Furqan Haider 2014-5-11

评论： Star Strider 2014-5-11

I am trying to integrate the following expression using 'quad' fuction but MATLAB is giving errors, kindly help me with the code. Code starts below:

f= @(x) ((sin(x))^2)/(((sin(x))^2)+(7));

% a, the lower limit

a= 0 ;

% b, the upper limit

b= pi/2 ;

answer=quad(f,a,b);

%%% Code ends

MATLAB gives following error:

??? Error using ==> mpower Inputs must be a scalar and a square matrix.

Error in ==> @(theta)((sin(theta))^2)/(((sin(theta))^2)+(7))

Error in ==> quad at 77 y = f(x, varargin{:});

Kindly help.

Star Strider 2014-5-11

You need to vectorize your code.

This works:

f= @(x) ((sin(x)).^2)./(((sin(x)).^2)+(7));
a= 0 ;
b= pi/2 ;
answer=quad(f,a,b);

produces:

answer =
     101.4509e-003

Furqan Haider 2014-5-11

Thank u again, I got what was required.

Best regards.

Star Strider 2014-5-11

My pleasure!

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