Not plotting all the values in a single graph

x = -10:0.1:10;
a = [1 3 5];

figure(1)

for i = 1:3
    u(1,:) = (1/4*a(i))*(1+erf(x+a(i)/sqrt(2)) - (1+erf(x-a(i)/sqrt(2))));
    plot(x,u(i,:))
end
hold on
grid on
xlabel('x')
ylabel('CDF')
legend('a=1','a=2','a=3','Location','best')
title('CDF of normal distribution with \sigma = 1')

Answer 1

[KSSV]

x = -10:0.1:10;
a = [1 3 5];
figure(1)
u = zeros(length(a),length(x)) ; 
for i = 1:length(a)
    u(i,:) = (1/4*a(i))*(1+erf(x+a(i)/sqrt(2)) - (1+erf(x-a(i)/sqrt(2))));
    
end
plot(x,u)
hold on
grid on
xlabel('x')
ylabel('CDF')
legend('a=1','a=2','a=3','Location','best')
title('CDF of normal distribution with \sigma = 1')