how to change color for a 2D plot

Dear all,

I have a 2D plot, in which consist of 5 line to make a "closed cell", I wish to color the line with different color. so I try it as below

x = [0.168149323 0.547990492 0.580721962 0.502272216 0.321295719 0.168149323];
y = [0.565541486 0.530969047 0.570321397 0.878624621 1.069086578 0.565541486];
z = [0 0 0 0 0 0];
%rgb is colormap value for different line 
rgb= [0.5020         0         0
    0.5000         0         0
    0.5000         0         0
    0         0    0.5156
    0         0    0.5156]
for k = 1 : length(rgb);
    hold on
    % Get new values.
    plot(x, y,'-', 'Color', rgb(k,:) ,'LineWidth',2)
end

but all the line I get has same color instead of different color, may I know how can I make them different color based on my colormap matrix?

Thank you in advance.

Answer 1

[KSSV]

x = [0.168149323 0.547990492 0.580721962 0.502272216 0.321295719 0.168149323];
y = [0.565541486 0.530969047 0.570321397 0.878624621 1.069086578 0.565541486];
figure
hold on
for i = 2:length(x)
    plot(x((i-1):i),y((i-1):i),'-')
end

[wei ong]

Thank you very much @KSSV, I got it!