where is the mistake in my programing?

clc
syms c h k
c11=106.8;
c33=54.57;
c13=9.68;
c15=0.28;
c35=-1.69;
c55=25.05;
r1=2727;
l=2.46;
u=5.66;
r2=7800;
i=sqrt(-1);
n=2.54;
a=fix(c33*c55);
b=fix(c35^2);
d=fix(c15*c33);
e=fix(c13*c35);
f=fix(c33+c55);
g=fix(c15*c35);
j=fix(c11*c33);
m=fix(c13^2);
o=fix(c13*c55);
p=fix(c55+c11);
q=fix((c11*c55)-c15^2);
r=fix(c15+c35);
t=fix(c11*c35-c13*c15);
a0=a-b;
a1=-2*i*(d-e);
a2=f*r1*(c^2)-2*g-j+m+2*o;
a3=-2*i*(r*r1*(c^2)-t);
a4=(r1^2)*(c^4)-p*r1*(c^2)+q;
s=[a0 a1 a2 a3 a4];
root=roots(s);
s1=root(1,1)
s2=root(2,1)
s3=root(3,1)
s4=root(4,1)
m1=-(fix(c55)*fix(s1^2)-2*i*fix(c15)*fix(s1)+r1*(c^2)-fix(c11))/(fix(c35)*fix(s1^2)-i*fix(c13+c55)*fix(s1)-fix(c15));
m1=simplify(m1,'steps',20)
m2=-(fix(c55)*fix(s2^2)-2*i*fix(c15)*fix(s2)+r1*(c^2)-fix(c11))/(fix(c35)*fix(s2^2)-i*fix(c13+c55)*fix(s2)-fix(c15));
m3=-(fix(c55)*fix(s3^2)-2*i*fix(c15)*fix(s3)+r1*(c^2)-fix(c11))/(fix(c35)*fix(s3^2)-i*fix(c13+c55)*fix(s3)-fix(c15));
m4=-(fix(c55)*fix(s4^2)-2*i*fix(c15)*fix(s4)+r1*(c^2)-fix(c11))/(fix(c35)*fix(s4^2)-i*fix(c13+c55)*fix(s4)-fix(c15));
m2=simplify(m2,'steps',20)
m3=simplify(m3,'steps',20)
m4=simplify(m4,'steps',20)
alpha=sqrt((l+2*u)/r2);
beta=sqrt(u/r2)
b0=(n^2)*((beta^2)/alpha^2);
b1=(n^2)*((1-((beta^2)/(alpha^2))^2))+n*(((c^2)/(alpha^2))-n)+n*((beta^2)/(alpha^2))*((c^2)/(beta^2)-n);
b2=((beta^2)/(alpha^2))*((c^2)/(alpha^2)-n)*((c^2)/(beta^2)-n);
p=[b0 0 b1 0 b2];
proot=roots(p);
p1=proot(1,1)
p2=proot(2,1)
p3=proot(3,1)
p4=proot(4,1)
n1=(((c^2)/(alpha^2))-n+n*((beta^2)/(alpha^2))*(p1^2))/(i*n*(1-((beta^2)/(alpha^2))*p1))
n2=(((c^2)/(alpha^2))-n+n*((beta^2)/(alpha^2))*(p2^2))/(i*n*(1-((beta^2)/(alpha^2))*p2))
K1=i*fix(c15)-m1*s1*fix(c35)+(i*m1-s1)*fix(c55);
K2=i*fix(c15)-m2*s2*fix(c35)+(i*m2-s2)*fix(c55);
K3=i*fix(c15)-m3*s3*fix(c35)+(i*m3-s3)*fix(c55);
K4=i*fix(c15)-m4*s4*fix(c35)+(i*m4-s4)*fix(c55);
K5=i*fix(c13)-m1*s1*fix(c33)+(i*m1-s1)*fix(c35);
K6=i*fix(c13)-m2*s2*fix(c33)+(i*m2-s2)*fix(c35);
K7=i*fix(c13)-m3*s3*fix(c33)+(i*m3-s3)*fix(c35);
K8=i*fix(c13)-m4*s4*fix(c33)+(i*m4-s4)*fix(c35);

Answer 1

[Walter Roberson]

No comments. That would be an automatic Fail for university assignments.

[Walter Roberson]

The code executes for me. I have no idea whether it produces the desired results, as there is no documentation as to what results are desired and no error message was provided.