MATLAB Answers

How to write a short syntax for the legend?

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Wiqas Ahmad
Wiqas Ahmad on 4 Mar 2021
Commented: Wiqas Ahmad on 4 Mar 2021
The legend in the plot shows seven lines is according to the length of EC in the program. I want to write one syntax for the legend in terms of the index i instead of seven, so that it repeats for the values of EC and gives me the same figure
clear all
EC = [0.0052 0.0078 0.0104 0.013 0.0156 0.0182 0.0208];
Reff = 7;%if we write Ref=4:1:20 then all the effective radii from 1 to 20 will be executed at once and will gives 20 figures, otherwise writing only one will execute only one
for j = 1:length(Reff)
hold on
for i = 1:length(EC)
filename1 = [num2str(EC(i)),'\',num2str(Reff(j)),'um\out_resultsG_I0.dat'];
I1 = getsignal(filename1);
I0_1 = sum(I1,2);
filename1 = [num2str(EC(i)),'\',num2str(Reff(j)),'um\out_resultsG_Q0.dat'];
Q1 = getsignal(filename1);
Q0_1 = sum(Q1,2);
hold off
title(['Effective radius=',num2str(Reff(j)),'\mum',', FOV=2mrad'],'FontSize',12,'FontWeight','normal');
xlabel('Depolarisation ratio \delta_{out}','FontSize',12,'FontWeight','normal');
ylabel('Cloud depth (m)','FontSize',12,'FontWeight','normal');

Answers (1)

Steven Lord
Steven Lord on 4 Mar 2021
Set the DisplayName property of each line just like you set the LineWidth. Then legend show will make the legend appear and use the DisplayName property values.
x = 0:360;
axis([0 360 -1 1])
hold on
plot(x, sind(x), 'ro-', 'MarkerIndices', 1:60:numel(x), 'DisplayName', 'sine')
plot(x, cosd(x), 'k^:', 'MarkerIndices', 30:60:numel(x), 'DisplayName', 'cosine')
legend show
I used MarkerIndices too because I didn't want the plots to be covered with their markers.
  1 Comment
Wiqas Ahmad
Wiqas Ahmad on 4 Mar 2021
I think this is not my question. Because if I want to plot seven lines, so I have to write seven syntaxes which I have already done it in the legend. My question is that If you see the syntax ['EC=',num2str(EC(1))in the legend which I have repeated for each line display in the legend. what I want is to write one syntax only with introducing index i so that it repeates seven times according to length of EC and give me the same plot.

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