legend in subplot graph

how to give legend for multiple graph case.

subplot(3,1,1)
plot(tn,transpose(utdelt(1,:)),'-r');
title('Displacement in X-Direction')
xlabel('time(sec)');
ylabel('Displacement (m)');
hold on 
plot(tn,transpose(utdelt(28,:)),'-g');
title('Displacement  in X-Direction')
xlabel('time(sec)');
ylabel('Displacement (m)');

[Alex Alex]

command "legend" ?

Answer 1

[Abhipsa]

Hello @Chaudhary P Patel,

To give a legend for multiple plots in a subplot, you can call the “legend” function after plotting all lines in a particular subplot.

You can refer to the following code snippet, which demonstrates how to add a legend when plotting multiple graphs in a subplot:

% Example dummy data (replace with your actual data)
tn = 0:0.1:10; % Time vector
utdelt = rand(30, length(tn)); % Dummy displacement data for 30 nodes

% Subplot 1: Displacement in X-Direction
subplot(3,1,1)
plot(tn, transpose(utdelt(1,:)), '-r'); % Node 1
hold on
plot(tn, transpose(utdelt(28,:)), '-g'); % Node 28
title('Displacement in X-Direction')
xlabel('Time (sec)');
ylabel('Displacement (m)');
legend('Node 1', 'Node 28')
grid on

% Subplot 2: Displacement in Y-Direction (dummy example)
subplot(3,1,2)
plot(tn, transpose(utdelt(2,:)), '-b'); % Node 2
hold on
plot(tn, transpose(utdelt(29,:)), '-m'); % Node 29
title('Displacement in Y-Direction')
xlabel('Time (sec)');
ylabel('Displacement (m)');
legend('Node 2', 'Node 29')
grid on

% Subplot 3: Displacement in Z-Direction (dummy example)
subplot(3,1,3)
plot(tn, transpose(utdelt(3,:)), '-k'); % Node 3
hold on
plot(tn, transpose(utdelt(30,:)), '--c'); % Node 30
title('Displacement in Z-Direction')
xlabel('Time (sec)');
ylabel('Displacement (m)');
legend('Node 3', 'Node 30')
grid on

The above code will generate the following out which displays the legend for each subplot.

You can refer to the below MATLAB documentation of “legend” for more details:

https://www.mathworks.com/help/releases/R2024b/matlab/ref/legend.html

I hope this helps!