How to plot multiple lines in a same figure using loop?

I have a 3d matrix named cluster. I need to plot multiple lines in a same graph. For example if I have 3 clusters in my cluster matrix then I plot them using the line below:

plot(cluster(1:6,1,1),cluster(1:6,2,1),'*',cluster(1:3,1,2),cluster(1:3,2,2),'+',cluster(1:6,1,3),cluster(1:6,2,3),'o');

Graph output:

But the number of cluster may change dynamically. So I need to plot the lines using loop (I guess). How to do that?

[Image Analyst]

Where are the endpoints of the lines? Where do you want the lines to go from, and to? Please attach image with desired result.

[per isakson]

• First read hold, Retain current plot when adding new plots
• Then try something like this

marker = {'+','o',...};
plot( x(:,1), y(:,1), '*' )
hold on
for jj = 2 : N
    plot( x(:,jj), y(:,jj), marker{jj} )
end

Answer 1

[KSSV]

S = rand(1,3) ;
N = 100 ;
E = rand(N,3)  ;
figure
hold on
S = repmat(S,N,1) ;
x = [S(:,1) E(:,1)] ; 
y = [S(:,2) E(:,2)] ;
z = [S(:,3) E(:,3)] ;
plot3(x',y',z')