Plotting data created from a for loop

I'm trying to plot data created from a for loop.

x1 = ns;
y1 = r;
x2 = ns2;
y2 = r2;
sz1 = 10;
sz2 = 30;
c = 'k';
scatter(x1,y1,sz1,c,'filled'); 
hold on;
scatter(x2,y2,sz2,c,'filled'); 
hold on; 
line(x1,x2); 
hold on; 
line(y1,y2);
xlim([0.89 1.01])
ylim([0 0.8])

Where ns, r, ns2 and r2 are data created from a for loop (n=1:5).

The code words fine without the lines, plotting all the data points, but I would like to create a set colour for every n (as opposed to a gradient), and join up each x1,x2 and y1,y2 separately for every n. At the moment, the lines go crazy and try to join everything up, and I have no idea how I'd set a separate colour for every n.

How would I achieve this?

Thanks

[Stephen23]

Continued here:

https://www.mathworks.com/matlabcentral/answers/337473-how-do-i-join-individual-scatter-points-with-a-line