solving constrait optimization using external varibales

Hi i am trying to solve constarint optimization usinf for loop, Actually i trying to maximize x with this constrains but olsa i have external variable that has some interval. Therefore i tyr to determined them using for loop but it is not working . What am i doing wrong?

for g=0:.1:0.5 % start at 0, step by 0.1 up to 1
for  t = 0.5:.1:1  
     if g +t <= 0.5    
fun = @(x)-((1-x)+ log(x)+log(g)+0*t);
lb = 0;
ub = 1;
A = [];
b = [];
Aeq = [];
beq = [];
x0 = (lb+ub)/2;
nonlcon = [];
options = optimoptions('fmincon','Algorithm','interior-point',...
    'OptimalityTolerance',1e-20, ...
    'StepTolerance', 1e-20, ...
    'ConstraintTolerance', 1e-20, ...
    'Display', 'iter' );
[x, fval] = fmincon(fun, x0, A, b, Aeq, beq, lb, ub, nonlcon, options);
disp(x)
disp(fval)
     else 
fprintf('\nThe number of people who agree is\n',x); 
     end
end

[Sinem Senel]

I use x as a g2 in my code and i am trying to maximize x. For g1 i use g and it should be 0=<g1=< 0.5 and fot t2 it should be 0.5=<t2=<1 . But they are not my constrains for optimization they are my intervals.