Changing the marker type for the nth entry in plot

I've been working on a project where we are changing 2 variables and the outputs are T values and Y values. Here's pretty much what the data looks like.

 T1 = [1;3;5;7];
 T2 = [0.9;2.7;5;6.8];
 T3 = [1;2.9;5.1;7];
 Y1 = [1;2;1;2];
 Y2 = [4;5;6;4];
 Y3 = [7;8;7;7];

 figure;
 hold on;
 plot(T1,Y1,':');
 plot(T2,Y2,'-.');
 plot(T3,Y3,'--');

As you can see all the X values pretty much line up around 1,3,5, and 7. I want each plot to not only have a unique line, but to have the nth entry to be a certain marker style, so all second entries (around X=3) to have a square marker for example. So you should be able to identify a point by its line style and marker style. Therefore, I would like the legend to have a label for each line style and marker style. So something like this:

 legend('line style 1','line style 2','line style 3','marker style 1','marker style 2','marker style 3','marker style 4');

Thanks

Answer 1

[Brendan Hamm]

You would have to accomplish this as a second plot, since each Line has a MarkerStyle associated with all of the data points. To do this for the 3rd entry:

T1 = [1;3;5;7];
T2 = [0.9;2.7;5;6.8];
T3 = [1;2.9;5.1;7];
Y1 = [1;2;1;2];
Y2 = [4;5;6;4];
Y3 = [7;8;7;7];

figure;
ax = axes;
hold on;

plot(T1,Y1,':');
plot(T2,Y2,'-.');
plot(T3,Y3,'--');

ax.ColorOrderIndex = 1; % Return to the previous color index

n = 3; % The nth element should be plotted as a square
plot(T1(n),Y1(n),'s');
plot(T2(n),Y2(n),'s');
plot(T3(n),Y3(n),'s');

[Louis]

Great idea - this even makes the legend very easy to set.