# How to plot multiple lines using error bar, AND plot them with legends

9 views (last 30 days)
Mike on 27 Jul 2018
Edited: dpb on 27 Jul 2018
figure(1)
x=[1,2,3,4,5];
y1=[10,20,30,40,50];
y2=[12,22,32,42,52];
y3=[13,15,16,17,18];
y1err=[0.1,0.2,0.3,0.4,0.5];
y2err=[0.2,0.3,0.4,0.5,0.6];
hold on;
p1=errorbar(x,y1,y1err,'-om');
p2=errorbar(x,y2,y2err,'-ob');
p3=plot(x,y3);
xlabel('x','Interpreter','Latex')
ylabel('y','interpreter','latex')
hold off
legend([p1],[p2],[p3],{'\$R_{MP}=60R_J\$'},{'\$R_{MP}=90R_J\$'},{'\$Dipole\$'},'Interpreter','Latex')
%legend([p1],{\$'leg1'\$},'Interpreter','Latex')
%legend([p2],{'\$leg2\$'},'Interpreter','Latex')
%legend([p3],{'\$leg3\$'},'Interpreter','Latex')
I have also tried using the legend configuration which is % out. But only the legend for the [p3] plot shows up.

Peter Meglis on 27 Jul 2018
Mike,
Your example code was really close. There were also a couple syntax errors but I think this is the legend that you intended.
...
y1err=[0.1,0.2,0.3,0.4,0.5]
...
p1=errorbar(x,y1,y1err,'-om')
...
legend({'\$R_{MP}=60R_J\$', '\$R_{MP}=90R_J\$', '\$Dipole\$'},'Interpreter','Latex')
https://www.mathworks.com/help/matlab/ref/legend.html
"legend(_,Name,Value) sets legend properties using one or more name-value pair arguments. When setting properties, you must specify the labels using a cell array, such as legend({'A','B'},'FontSize',12)."

dpb on 27 Jul 2018
Edited: dpb on 27 Jul 2018
Syntax error in the LaTeX strings...it doesn't like the cellstr inputs; use straight character strings if separate elements are passed.
legend('\$R_{MP}=60R_J\$','\$R_{MP}=90R_J\$','\$Dipole\$','Interpreter','Latex')
works here altho there's a warning 'Ignoring extra legend entries' that otomh...hmmm, I wonder? 'Interpereter' isn't allowed as named parameter pair here even though it's documented; I don't see the reason for that, but I note the tab completion only shows up 'Orientation' and 'Location' at that point. Looks like bug on that part, maybe??? Or at least it's inconsistent with documentation unless there's something about using the fancy characters that interacts with the input parsing.
legend('\$R_{MP}=60R_J\$','\$R_{MP}=90R_J\$','\$Dipole\$')
seems to work with no warnings (R2017b)
Forgot to note that per documentation, to use cellstrings, it's an array of 'em, not a list...
legend('{\$R_{MP}=60R_J\$','\$R_{MP}=90R_J\$','\$Dipole\$'},'Interpreter','Latex')
works including the named parameter with no warnings. Seems to be some input parsing problems with some input syntax forms that are documented to work.

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