Plotting after a for loop

I'm having trouble plotting the graph in the picture. I've been trying with and without the for loop in the code but i have no idea what i'm doing wrong. please help :(

for x =[-5:5];

if x < 0 ;
    y = 0
else if x >= 0 ;
        y = 0.5
    end
end
end
plot(x,y)
hold on

Answer 1

[KSSV]

x = -5:5 ; 
y = zeros(size(x)) ; 
y(x>=0.5) = 0.5 ; 
plot(x,y)

[Lukas Arkenklo]

That does not give the correct graph :(

[KSSV]

You should refine x.

x = linspace(-5,5,1000) ; 
y = zeros(size(x)) ; 
y(x>=0.5) = 0.5 ; 
plot(x,y)