# why matlab can't plot signals ?

4 views (last 30 days)
Mohamed on 6 Jan 2024
Commented: Dyuman Joshi on 6 Jan 2024
clc;
clear all;
close all;
Fc= input(' Carrier frequency = ');
Fm= input(' message frequency = ');
Am=input('Message signal amplitude = ');
Ac=input('Carrier signal amplitude = ');
B=input('Modulation index = ');
t=0: 0.0001;0.1;
C_t= Ac*cos(2*pi*Fc*t);
subplot(3,1,1);
plot(t,C_t);
ylabel('amplitude');xlabel('time index');title('Carrier signal');
M_t= Am*sin(2*pi*Fm*t);
subplot(3,1,2);
plot(t,M_t);
ylabel('amplitude');xlabel('time index');title('Modulating signal');
S_t = Ac*cos((2*pi*Fc*t)+ B*cos(2*pi*Fm*t));
subplot(3,1,3);
plot(t,S_t);
ylabel('amplitude');xlabel('time index');title('Frequency Modulated signal');
Mohamed on 6 Jan 2024

Dyuman Joshi on 6 Jan 2024
Edited: Dyuman Joshi on 6 Jan 2024
Because there's a typo, semi-colon instead of colon in defining t.
% v
t=0: 0.0001;0.1;
t
t = 0
t here is a scalar, which when you supplied to plot() without specifying a marker does not result in a plot.
Fix the typo and your code will work as expected.
Mohamed on 6 Jan 2024
thanks mate
Dyuman Joshi on 6 Jan 2024
You're welcome!

madhan ravi on 6 Jan 2024
t = 0 : 0.0001 : 0.1;
% ^
Mohamed on 6 Jan 2024
thanks

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