On Fri, 11 Sep 2015, Sven Schreiber wrote:
 section 15.4 of the guide enumerates matrix operators, and there is
an
 elementwise equality comparison (.=), but no corresponding inequality
 comparison (no .!=). And indeed gretl doesn't accept .!=, but why? I
 know this can be worked around, but the same argument would hold for .>
 and .<, for example. 
Good question, I'll take a look at it. I'm not sure offhand if we 
support any 3-character operators at present but even if not there's 
no inherent reason why we shouldn't.
Allin