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

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

Answer 1

[Honglei Chen]

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)

[Nicolas]

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

Answer 2

[Nicolas]

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

Answer 3

[Honglei Chen]

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))