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[tex]r(\alpha) =\frac{1}{\theta} \int_{0}^{\theta} \ e^{-jk*2Rsin(\sigma/2)sin(\sigma/2+\alpha) } \,d\sigma[/tex]

I have tried to solve it but it gives this error :

Warning: Explicit integral could not be found.

> In C:\MATLAB6p5\toolbox\symbolic\@sym\int.m at line 58

In C:\MATLAB6p5\work\directividadCurvado.m at line 12

??? Error: Assignment statements do not produce results. (Use == to test

for equality.)

Error in ==> C:\MATLAB6p5\toolbox\symbolic\@sym\double.m

On line 45 ==> D = reshape(eval(X),m,n);

Error in ==> C:\MATLAB6p5\work\directividadCurvado.m

On line 12 ==> ppp=double(int(exp(-i*k*2*R*sin(x/2).*(sin(x/2)+t)),'x','0','ang'));

please help me. Excuse me by my writing. Thanks.