Ploting a graph with if else statement

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Ron
Ron 2018-9-30
评论： jonas 2018-9-30
I am trying to plot this graph
fs=100000000 % samples per second
dt = 1/fs % seconds per sample
StopTime = 5E-6 % seconds
Fc = 5E6; % hertz
for t = (0:dt:StopTime) % seconds
if t<1E-6
y = 2*sin(2*pi*Fc*t)
else
y=0
end
end
plot (t,y) % Plot the signal versus time
The output of y is exactly what I need but I am unable to plot the graph of the y output with respect to time.
Thank you,

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jonas
jonas 2018-9-30
编辑：jonas 2018-9-30

Try this instead, no for loop needed

fs = 100000000                
dt = 1/fs                  
StopTime = 5E-6             
Fc = 5E6;                   
t = 0:dt:StopTime
y = nan(size(t))
y(t<1E-6) = 2*sin(2*pi*Fc*t(t<1E-6))
y(~(t<1E-6)) = 0
plot(t,y)

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