请教matlab积分怎么积分？？？

i=1:0.01:pi;
( f  w% ?, |5 _$ P( E2 s/ ox=1:0.01:pi;7 z9 d( i3 b+ w- O! U
N1=13;
/ @, }* N) r, G# X. m5 O4 z
) H: J$ q6 {: d/ ON2=15;

for i=1:pi+1# m# i$ s0 \( _) Y+ q8 \
   if 0.4*pi+1<=x(i)+1 && x(i)+1<=0.6*pi+1
6 l' V! e# q0 D$ w0 b  `   phi_2(i)=(N2-N1)*x(i)+1/2;
; P; E: ^" Q% U, r  G   end  ^: P8 Y8 S3 s1 ~
    if 0.0*pi+1<=x(i)+1 && x(i)+1<=0.2*pi+12 y5 g: K; o7 Y: I) c4 \8 |5 E# q
    phi_2(i)=((N2-N1)*x(i)+1+pi)*0.5;' U( R6 M# m5 |

2 h+ ~. m$ c9 F5 r3 @% O/ v    end
0 V: n, Y/ z) c$ `end

syms i;
6 Y% E- o( Y6 [6 qEr=1-abs(exp(1j*(phi_2(i)-((N1+N2)/2)*i)).*cos(((N2-N1)/2)*i-phi_2(i) )).^2;

s=int((Er),0.4*pi,0.6*pi);