新手求问怎么解决

clear;
n0=1;
nL=3.4;
nN=2.3;
d1=0.1;
D1=d1*nL;
d2=0.2;
D2=d2*nN;
k=1;
z=19;
d3=d2/z;
X=1.7;
Z=377;
w1=3;w3=1;
point=20000;
is=1;
w2=(w3-w1)/point;
L=(d1+d2)*k;
a0=0/180*pi;
A=n0*sin(a0);
a1=asin(A/nL);
p0=n0*cos(a0);
p1=nL*cos(a1);
e=2.72;
pi2=pi*2;
m=1;
s=1;
E=5;
H=E/Z;
D=[E;H];
M=1;
for y=w1:w2:w3,k<5
while m<20,y=w1:w2:w3
n(m)=nN+(X*E^2);
a2=asin(A/n(m));
b2=(pi2/y)*n(m)*d3*cos(a2);
p2=n(m)*cos(a2);
mN=s*[cos(b2),-(i/p2)*sin(b2);-i*p2*sin(b2),cos(b2)];
D=mN*D;
s=mN;
m=m+1;
end;
b1=(pi2/y)*nL*d1*cos(a1);
mL=[cos(b1),-(i/p1)*sin(b1);-i*p1*sin(b1),cos(b1)];
D=mL*D;
M=M*(mN*mL);
s=1;
m=1;
k=k+1;
end;
t=2/(M(1)+M(3)+M(2)+M(4));
T=10*log10(t^2);
aa(is,1)=y;
aa(is,2)=100*T;
is=is+1;
end;
lambda=aa(:1);
TL=aa(:2);
plot(lambda,TL,'b')
运行后显示
Error using /
Matrix dimensions must agree.
怎么改，新手求救，刚学