Em 2016-08-17, Henrique Andrade escreveu:
 Dear Fernando,
 I'd fixed the first line of your code and it worked just fine here on
 my Windows 7 PC (Gretl 2016c).
 matrix Q_s = {1, 1; 1, 1}  # BEFORE: matrix Q_S = {1, 1; 1, 1}
 scalar beta_p = 0.9
 matrix Q = beta_p * Q_s
 Using "*" or ".*" did not change the results. I will test on my OS/X
 computer tonight to check if is something specific to Windows.
 Um abraço,
 Henrique Andrade 
Tested here on my Mac and it also worked as expected. I would like to
suggest you install the most recent version of Gretl.
Best regards,
Henrique Andrade