how to change a value inside many cell arrays

Hi I would like to change c1 value in velocity u1,u2 pressure p1,p2 and sumint1,2. I need to iterate Newton-Raphson in MATLAB. It seems easy but I cannot figure out where I am wrong. The problem is:

1) If m=1 take c1=c1b and do the loop for u1,2(i) and p1,2(i)

2)If m=2 take c1=c1+dc and this time do the loop with new c1 for u1,2(i) and p1,2(i)

3) If m=3 take c1=(c1*st(1)-(c1-dc)*st(2))/(st(1)-st(2)) and do the loop for new c1.

sumint are inside of the integrals.

I need to plot these figures in the code but MATLAB gives errors below. Please help me.

Relevant part of the code:

ii=101;
fik=0.4;
u = cell(2, 1);
ini_cond = [0,0];
for i = 1:2;
   u{i} = zeros(1,ii);
   u{i}(:, ii) = ini_cond(i) * rand(1, 1);
end    

for i=1:ii;
        fikness=fik*sin(pi.*x);
        u{1}(i)=(c1-H1D*(x-0.5)+AD/2.*(x-0.5).^2)./(H1-0.5*fikness-A*(x-0.5));
        u{2}(i)=(c2+H1D*(x-0.5)-AD/2.*(x-0.5).^2)./(1.-H1+0.5*fikness+A*(x-0.5)); 
end

p = cell(2, 1);
q = cell(2, 1);

for i = 1:2;
   p{i} = zeros(1,ii);
   q{i} = zeros(1,ii);
end    

p{1}(1)=0.5*(1.-u{1}(1).^2);
q{1}(1)=0;
p{2}(1)=0.5*(1.-u{2}(1).^2);
q{2}(1)=0;

for i=2:101
q{1}(i)=q{1}(i-1)-dx*(u{1}(i-1)-ub{1}(i-1))./dt;
p{1}(i)=0.5*(1.-u{1}(i).^2)+q{1}(i);
q{2}(i)=q{2}(i-1)-dx*(u{2}(i-1)-ub{2}(i-1))./dt;
p{2}(i)=0.5*(1.-u{2}(i).^2)+q{2}(i);

end

st = zeros(2, length(t));
st(1,:)=p{1}(100)-p{2}(100);
m=m+1;

if m==3; 
c1=(c1*st(1)-(c1-dc)*st(2))/(st(1)-st(2));
c2=1-c1;
end
for i = 1:2;
   sumint{i} = zeros(1,length(t));
end 
sumint = cell(2, 1);
sumint{1}(1)=0.5*(p{2}(1)-p{1}(1));
sumint{2}(1)=0.5*(p{2}(1)-p{1}(1)).*(-1/2);

for i=2:ii-1;
x=(i-1)*dx;
sumint{1}(i)=sumint{1}(i-1)+(p{2}(i)-p{1}(i));
sumint{2}(i)=sumint{2}(i-1)+(p{2}(i)-p{1}(i))*(x-1/2);
end

Briefly the question is how can I change my cell arrays u1,u2,p1,p2 depending on different c1 values?