On Fri, Jul 24, 2026 at 1:53 PM Artur Bala <artur.bala.tn@gmail.com> wrote:
>
> Thank you Sven,
> It's the script file on Fast Fourier Transform from Gretl's examples.
> (I just grabbed some script files at random for testing purposes, nothing specific.)

Thanks for the report, Artur. That example script was way out of date;
we should have noticed! It's now replaced in git. Here's a preview of
the corrected version:

# define two polynomials
a = { 1, 0.5,    0, 0 }'
b = { 1, 0.3, -0.8, 0 }'
print a b
# perform the transforms
f = fft(a ~ b)
print f
# multiply the two transforms
fc = f[,1] .* f[,2]
print fc
# compute the coefficients of c = a * b via the inverse transform
c = ffti(fc)
print c

Allin
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