Matlab - Ayuda con gráfica

n=24;

hold on

plot([0 0,[n 0],'g')

plot([0 1],[n-1,0],'r')

plot([0 2],[n-2,0],'b')

plot([0 3],[n-3,0],'m')

hold off

n=6;

hold on

plot([0 0],[n-0 0],'r')

plot([0 1],[n-1,0],'r')

plot([0 2],[n-2,0],'r')

plot([0 3],[n-3,0],'r')

plot([0 4],[n-4,0],'r')

plot([0 5],[n-5,0],'r')

plot([0 6],[n-6,0],'r')

hold off

n=6;

hold on

for i=0:n

    plot([0 i],[n-i,0],'r')

end

hold off

figure(1)

n=6

axis([-n n -n n])

hold on

for i=-n:n

    if i<0

       plot([0 i ],[n+i,0],'b')

    else

     plot([0 i ],[n-i,0],'g')

    end

end

hold off