MATLAB: Input conditional sine wave

for loopif statementindexing

Hi, I am trying to input a signal which is a sine wave between 3 and 7 seconds and zero everywhere else. I am trying to create an 'for loop' to do this by indexing the time vector but I can't make it work, the graph just displays nothing (assuming matlab thinks x = 0 for all time?)…is there anything I've missed?
t = [0:0.1:10];
for k=1:length(t)
if t(k)>=3 && t(k)<=7
      x = 5*sin(4*pi *t);
else
    x = 0;
end
end
plot(t,x)
Any help would be greatly appreciated 🙂

Best Answer

t = 0:0.1:10;
x = 5*sin(4*pi *t);
x(t<3) = 0 ;
x(t>7) = 0 ;
plot(t,x)
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