Legend issue: not all the entrties are shown.

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john_arle
john_arle 2019-4-7
评论： Walter Roberson 2019-4-7
Hello there,
I am having trouble with my legend.
I have single plot, and then I typed "hold on" and added a curve to my plot.
I cannot insert a correct legend though!
How is this possible?
Thank you in advance.
Cheers,
Andrea.
plot(linspace(0.03,0.3), poiseuille(linspace(0.03,0.3)),'k')
axis([0 0.3 0 12])
title('Velocity profiles for $\epsilon = 0.1$','Interpreter','latex',...
'fontweight','bold','fontsize',20)
xlabel('$r$ [m]','Interpreter','latex','fontweight','bold','fontsize',20);
ylabel('$u=u(r,t=0)$ [m/s]','Interpreter','latex',...
'fontweight','bold','fontsize',20);
leg_1 = legend('Poiseuille' );
set(leg_1,'FontSize',10);
hold on
plot(linspace(0.03,0.3), vel((1:100), 0),'color', [0.3 0.3 0.55])
leg_2 = legend( {'$\alpha = 0.1$'}, 'Interpreter','latex' );
set(leg_2,'FontSize',15);
hold on

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采纳的回答

A. Sawas
A. Sawas 2019-4-7
You can only add one legend to the axis. So to solve your problem put all the names in one legend call. You may modify your code to do like this:
%leg_1 = legend('Poiseuille' );
%set(leg_1,'FontSize',10);
% rest of your code
leg_2 = legend( {'Poiseuille', '$\alpha = 0.1$'}, 'Interpreter','latex' );
set(leg_2,'FontSize',15);
hold on
  1 个评论
Walter Roberson
Walter Roberson 2019-4-7
Note that you will only get a single fontsize when you do this. You could include a \fontsize as part the latex code, but be aware that MATLAB might not include enough space between entries. It would probably be safer to 'Fontsize' the larger font, and \fontsize the other entries down to what they need.

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