请教matlab积分怎么积分？？？

i=1:0.01:pi;4 |( q7 T6 |, }* q) p/ h
x=1:0.01:pi;
: U* g: o: e, l) C0 j$ `N1=13;
- H, f( C# B) I1 _
$ F0 M+ [( \7 q# VN2=15;

for i=1:pi+1
  A! B5 s. f$ [' ]   if 0.4*pi+1<=x(i)+1 && x(i)+1<=0.6*pi+1) t" {  S( B. r4 M2 U. d
   phi_2(i)=(N2-N1)*x(i)+1/2;
" I/ }! @" [8 s! b; u8 i   end
2 M( E+ B* T5 A+ Y' j    if 0.0*pi+1<=x(i)+1 && x(i)+1<=0.2*pi+1
- C) j' D& o+ H6 i& I* l2 R* b0 Z    phi_2(i)=((N2-N1)*x(i)+1+pi)*0.5;( z6 b$ U7 y5 O1 d- I
# I) t$ y' b. N7 B$ l0 |; `
    end6 E0 s# p8 ^1 K7 K4 a& V& I
end

syms i;1 I- w* [; |: l* e$ V) j: ^
Er=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);