Thanks very much Professor Cottrell for your modificaitons and
explanations. Just one thing:
> 1)- In the "Restrict based on criterion" window, if I
use comma as
> the decimal sign I get a syntax error.
That's expected, and will not change: when you specify a criterion
for restricting the sample "based on a criterion" you're accessing
the "genr" mechanism, and that mechanism doesn't/can't support the
decimal comma, for one thing because in that context ',' is the
separator for function arguments.
Would it be possible that gretl (depending on the locale setting)
automatically replaces commas with dots (and say semicolons with
commas) before sending the command to genr? I insist because this is
someting that can be important in some places and/or countries.
“An expert is a person who has made all the mistakes that can be made
in a very narrow field.” - Niels Bohr (1885-1962)