This will draw a reference line, with a slope and intercept of 0.
refline(0,0)
However, I do see that it does show up if I use legend, with no arguments. So this shows the refline in the legend:
plot(randn(1,10),randn(1,10),'o')
refline(0,0)
legend
Instead, I can call legend with my own descriptions. So if there are 3 curves, just call legend with 3 names.
plot(randn(10,3),randn(10,3),'o')
refline(0,0)
n = 3;
legtit = cell(1,n);
for i = 1:n
legtit{i} = ['Data ',num2str(i)];
end
legend(legtit(:))
As you can see, no refline in the legend.
