% inefficient way of plotting
x = [1 2 3 4 5 6 7 8] ;
y = [] ;
figure (3) ;
for i = 1 : length(x)
    y(i) = (x(i))^i ;
    plot (x(i), y(i),'r+') ;
    hold on ;
end

% efficient way 
x = [1 2 3 4 5 6 7 8] ;
y = [] ;
figure (3) ;
for i = 1 : length(x)
    y(i) = (x(i))^i ;
end
plot (x, y, 'k+:') ;