hello , somebody could help me to solve in MATLAB this integral? [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.