How to show legend for only a specific subset of curves in the plotting?

Question

t = 0 : 0.01 : 2 * pi;
s = sin(t);
c = cos(t);
m = -sin(t);

hold on;
plot(t, s, \'r\');
plot(t, c, \'b\');
plot(t, m, \'g\');
hold off;

legend(\'\', \'cosine\', \'         


        

Answer 1

You could just change the order in wich the curves are plotted and apply the legend to the first curve:

t = 0 : 0.01 : 2 * pi;
s = sin(t);
c = cos(t);
m = -sin(t);

plot(t,c,t,s,t,m)  % cosine is plotted FIRST
legend('cosine')   % legend for the FIRST element

if i'd want to put in a legend for cosine and -sine:

plot(t,c,t,m,t,s)  % cosine and -sine are first and second curves
legend('cosine', '-sine')