%Marcha aleatoria---------------------------

clear x

p=0.5;
deltax=1;
T=10000;

x(1)=0;
for i=2:T
    if (rand < p)
        x(i)=x(i-1)+deltax;
    else
        x(i)=x(i-1)-deltax;
    end
end

plot(1:T,x)
grid on
xlabel('n');
ylabel('x_n');