On Mon, 28 Sep 2015, Schaff, Frederik wrote:
 thanks very much Allen! I'll take the advice to heart.
Fortunately 
 in the case where these garbage values are "created" a part of the 
 analysis (corresponding to these values) has not been conducted 
 and that is flagged (in another "non-garbage" variable), so I can 
 post-process these values. What are the "maximal" values gretl 
 takes as import? +-1e100 and +-1e-100? 
Gretl accepts the judgment of the C library on numerical underflow 
or overflow. On the big side we can be fairly definite: anything 
less than 1.79769e308 should be fine. On the close-to-zero side 
numbers greater in absolute value than 1e-308 should be OK for most 
C libraries.
Allin