How to make a plot of iteration count vs residual error?

How to make table for this iteration versus residual error. I try to make table but not got it. In which line and what matlab code need to include for this below program.

for k=1:n

a=(k);b=(k+1);

for kk=1:10

pt=0.5*((b-a)*(kk)+(b+a));

rf=(((a11(pt)*d3fn(pt))+(a12(pt)*d2fn(pt))+(a13(pt)*dfn(pt))+...

(a14(pt)*fn(pt)))*dfn(pt))*(kk)*0.5*(b-a);

rg=(((c11(pt)*d2gn(pt))+(c12(pt)*dgn(pt))+...

(c13(pt)*gn(pt)))*gn(pt))*(kk)*0.5*(b-a);

ry=(((d11(pt)*d2yn(pt))+(d12(pt)*dyn(pt))+...

(d13(pt)*yn(pt)))*yn(pt))*(kk)*0.5*(b-a);

rrf(iter) = norm(rf,inf);

rrg(iter) = norm(rg,inf);

rry(iter) = norm(ry,inf);

end

end

semilogy(1:iter,rrf,'-*',1:iter,rrg,'-*',1:iter,rry,'-*','linewidth',1.8)

Answer 1

[Mathieu NOE]

Hello

iter was not initialized nor incremented in your loop

this should work now (could not test it as variables are not initialised in the code you posted)

iter = 0; % added this 
for k=1:n
     a=(k);b=(k+1);
        for kk=1:10
            iter = iter+1; % added this also
           pt=0.5*((b-a)*(kk)+(b+a)); 
             rf=(((a11(pt)*d3fn(pt))+(a12(pt)*d2fn(pt))+(a13(pt)*dfn(pt))+...
                 (a14(pt)*fn(pt)))*dfn(pt))*(kk)*0.5*(b-a);
             rg=(((c11(pt)*d2gn(pt))+(c12(pt)*dgn(pt))+...  
                (c13(pt)*gn(pt)))*gn(pt))*(kk)*0.5*(b-a);
             ry=(((d11(pt)*d2yn(pt))+(d12(pt)*dyn(pt))+... 
               (d13(pt)*yn(pt)))*yn(pt))*(kk)*0.5*(b-a);
            rrf(iter) = norm(rf,inf);
            rrg(iter) = norm(rg,inf);
            rry(iter) = norm(ry,inf);   
             end
        end         
 semilogy(1:iter,rrf,'-*',1:iter,rrg,'-*',1:iter,rry,'-*','linewidth',1.8)

[Mathieu NOE]

Hi

problem solved ?

[Mathieu NOE]

hello again

problem solved ?