[Gretl-users] Re: Error executing the convolve.inp script file
On Fri, Jul 24, 2026 at 1:53 PM Artur Bala <artur.bala.tn(a)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 That example script was way out of date;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