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Add a legend in a plot with multiples lines

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Hi, I am having a small probllem in adding a legend, I just can't get all the names for different frequencies:
clear all;
close all;
load psi_20.mat
load time_20.mat
psi_20 = psi;
time_20 = time;
plot(time_20,psi_20)
legend('20Hz')
hold on
load psi_40.mat
load time_40.mat
psi_40 = psi;
time_40 = time;
plot(time_40,psi_40)
legend('40Hz')
hold on
load psi_60.mat
load time_60.mat
psi_60 = psi;
time_60 = time;
plot(time_60,psi_60)
legend('60Hz')
hold on
load psi_80.mat
load time_80.mat
psi_80 = psi;
time_80 = time;
plot(time_80,psi_80)
legend('80Hz')
hold on
load psi_100.mat
load time_100.mat
psi_100 = psi;
time_100 = time;
plot(time_100,psi_100)
legend('100Hz')
hold on
I have matlab 2014b

Accepted Answer

Mathieu NOE
Mathieu NOE on 16 Oct 2020
hi
simplest code below - more sophisticated is always possible...
% simple code
load psi_20.mat
load time_20.mat
psi_20 = psi;
time_20 = time;
load psi_40.mat
load time_40.mat
psi_40 = psi;
time_40 = time;
load psi_60.mat
load time_60.mat
psi_60 = psi;
time_60 = time;
load psi_80.mat
load time_80.mat
psi_80 = psi;
time_80 = time;
load psi_100.mat
load time_100.mat
psi_100 = psi;
time_100 = time;
plot(time_20,psi_20,time_40,psi_40,time_60,psi_60,time_80,psi_80,time_100,psi_100);
legend('20Hz','40Hz','60Hz','80Hz','100Hz')

More Answers (1)

Durganshu
Durganshu on 16 Oct 2020
Don't use legend multiple times.
You can use this command after plotting all the plots.
legend('20Hz', '40Hz', '60Hz', '80Hz', '100Hz')
Hope this helps!

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R2014b

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