How do I plot this simple function in matlab

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Poonam
Poonam 2012-11-2
I have a function f(x) = +i x>0;
= 1 x=0;
= -i x<0 ;
I am confused because of the existence of the complex number. Suppose I want to take the fourier transform of this function. I do y=fft(f(x)); plot(x,real(y)); Is this right?

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Wayne King
Wayne King 2012-11-2
Did you simply want to plot that complex-valued function of a real variable, f(x), you can do that with stem3
x= -50:50;
y = zeros(size(x));
y(x<0) = -1i;
y(x>0) = 1i;
y(x==0) = 1;
stem3(x,real(y),imag(y))
xlabel('x'); ylabel('Re(f(x))'); zlabel('Imag(f(x))');
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Poonam
Poonam 2012-11-2
Hi,
I loved the way you plotted it. Thank you. I would like to know if I could combine the 3 conditions of y and put into one equation. I actually want to multiply this with another function and take the FFT of it? How could I do that?

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更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-11-2
编辑：Azzi Abdelmalek 2012-11-2
x=rand(100,1) % eg
y=fft(x)
plot(abs(y))
why real(y)?

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