On Sun, 17 Feb 2013, Sven Schreiber wrote:
 I noticed in the context of forecast evaluation statistics that
gretl
 prints "1.#QNB" for some unavailable numbers on Windows (recent
 snapshot), whereas on Linux it prints "nan". Don't know if that's
 intenden/normal. 
That's just Windows' nice user-friendly way of printing NaNs.
Allin