little problem in plotting a signal. Both x, y has the same lenght but is not plotting correctly

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Nicolas
Nicolas 2012-3-14
Hello!! I have this code and I am not getting what I should, that actually is a kind of sin that decrease whith the time. I have check that both arrays have the same lenght, but the problem is that the variable a that I used for the loop is fixed to 100. All this values I checked at the workspace. Here it goes the code
Tc=1*10e-3;
f=linspace(0.1,2e6);
R=zeros(1,100);%preallocate
for a=1:1:100
R(a)=i*Tc*sinc(f(a).*Tc/2).*sin(pi*f(a).*Tc/2);
end
plot(f,R)
Thanks in advance Nicolas

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回答（3 个）

Honglei Chen
Honglei Chen 2012-3-14
I don't think a is the issue here. In your R(a), do you mean pi instead of i for the first term?
BTW you should be able to write this in vectorized form, just do
R = pi*Tc*sinc(f.*Tc/2).*sin(pi*f.*Tc/2)
  1 个评论
Nicolas
Nicolas 2012-3-14
Hello!Thanks for the response.
By i I mean the imaginary unit. What I am trying to do with the loop is to calculate the vector R, the 100 positions of R vector.
What I dont understand is the vectorized form?I dont need to write the loop then?
thanks

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Nicolas
Nicolas 2012-3-14
Hello!Thanks for the response. By i I mean the imaginary unit. What I am trying to do with the loop is to calculate the vector R, the 100 positions of R vector. What I dont understand is the vectorized form?I dont need to write the loop then? thanks
Honglei Chen
Honglei Chen 2012-3-14
Yes you don't need to write the loop, if you mean for imaginary part, then it is
R = 1i*Tc*sinc(f.*Tc/2).*sin(pi*f.*Tc/2)
plot(f,imag(R))

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