what is the best way of showing legend?

could anyone tell me what is the best way of showing legend in this example?

plot(x1,y1,'o-r',-x1,y1,'o-r');hold on;
plot(x2,y2);
%I tried this way:
legend('show');legend('plotx1y1','','plotx2y2');
% but it does not look good!

I appreciate any help!

Answer 1

[dpb]

You don't explain what you don't like nor show us what you got and we don't have your data, so we're flying blind here, but I'll guess

plot([-x1(:);x1(:)],[y1(:);y1(:)],'o-r');
hold on;
plot(x2,y2);
legend('plotx1y1','plotx2y2');

or

hL=gobjects(3,1);                           % preallocate for line handles to come
hL=plot(x1,y1,'o-r',-x1,y1,'o-r');          % first two
hold on;
hL(3)=plot(x2,y2);                          % and third...
legend(hL([1 3]),'plotx1y1','plotx2y2');    % label the desired ones

or

plot(x1,y1,'o-r','DisplayName','plotx1y1','Annotation','on');   % first, use legend
hold on;
plot(-x1,y1,'o-r','Annotation','off');                          % no legend on second
plot(x2,y2,'DisplayName','plotx2y2','Annotation','on');         % show third
legend                                                          % turn the legend on

[Ham Man]

Many thanks, I used the first suggested method and it works fine!