Chirp plot is not drawing
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My chirp function is not being drawn for some reason, only stem samples are visible. If comment out stem command the plot is being drawn but to time 2e-3.
function fun6
tmax=4e-3;
T=2e-3;
fs=6e3;
xmax=2;
f1=0.5e3;
f2=1.5e3;
t=linspace(0,tmax,2001);
tt=mod(t,T);
x=xmax*chirp(tt,f1,T,f2);
n=fix(tmax*fs);
td=(0:n-1)/fs;
tdd=mod(td,T);
xd=xmax*chirp(tdd,f1,T,f2);
close all;
plot(tt,x,'b');
stem(td,xd,'r*');
grid on;zoom on;hold on;
回答（1 个）
You need to place hold on before you add a second plot to your axes. Your code currently replaces the plot with the stem plot.
Your plot only goes to 2e-3 because that is what you define tt using mod. Perhaps you meant to use t when plotting?
tmax=4e-3;
T=2e-3;
fs=6e3;
xmax=2;
f1=0.5e3;
f2=1.5e3;
t=linspace(0,tmax,2001);
tt=mod(t,T);
x=xmax*chirp(tt,f1,T,f2);
n=fix(tmax*fs);
td=(0:n-1)/fs;
tdd=mod(td,T);
xd=xmax*chirp(tdd,f1,T,f2);
plot(t,x,'b'); % changed tt to t
hold on
stem(td,xd,'r*');
hold off
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2022-5-17
2022-5-17
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