For the future, please post code in a formatted code block. Don't post pictures of code. Nobody can run a picture of code. They have to sit there and manually retype the whole thing, often unintentionally omitting or adding typos.
If I understand you correctly, you're trying to change the variable that's controlling the loop exit. How about something like this?
variableundertest=S;
while sum(variableundertest(:))~=0
f=sum(H(variableundertest==1,:),1);
m=max(f);
i=find(f==m);
w=mod(i+1,2);
a=V;
a(i)=w;
L=mod(H*a',2);
if L==0
break;
else
n=n+1;
variableundertest=L;
end
end
I have no idea what this code is intended to do, but bear in mind that this would now mean that variableundertest is recalculated on every pass through the loop.
