7-31  Fourier任任
⣺Enterȷϡ
>> syms t u v w x
>> ifourier(w*exp(-3*w)*sym('Heaviside(w)'))
ans =
1/2/(-3+i*x)^2/pi
>> ifourier(1/(1 + w^2),u)
ans =
1/2*exp(-u)*Heaviside(u)+1/2*exp(u)*Heaviside(-u)
>> ifourier(v/(1 + w^2),v,u)
ans =
-i/(1+w^2)*Dirac(1,u)
>> ifourier(sym('fourier(f(x),x,w)'),w,x)
ans =
f(x)
>>
