Fourier transform in Matlab

Hello, everyone.

I am a newbie in Matlab. I started this several days ago. I am trying to do fourier transform (not FFT) in Matlab, but there comes errors. I am sure that that is grammar problems. Could you tell me what is wrong in the code ?

 clear all
lamb = 800000;
A1 = 0.6; 
A2 = -1.8; 
n = 2.48; 
k = 4.38 ;
xi = lamb/(4*pi*k);
chi = lamb/(4*pi*n);
v = 5894;
P1 = real((2*(n+1i*k))/(1-(n+1i*k)^2)*(A1+1i*A2));
P2 = imag((2*(n+1i*k))/(1-(n+1i*k)^2)*(A1+1i*A2));
syms t
F = -6*(cos(0.25*t)-0.209611)*exp(-(t/10)^2);
G =(P1*sin(v/chi*t)+P2*cos(v/chi*t)*sign(t))*exp(-abs(t)*v/xi);
ezplot(G,[-50 50])
FF = fourier(F)
GG = fourier(G)
figure;
ezplot(FF,[-20 20])
ezplot(GG,[-20 20])

Thank you in advance.

[Walter Roberson]

What difficulty are you encountering? Other than the fact that GG is complex valued except at 0?

Are you certain, by the way, that you want to be plotting over negative frequencies?