Following up on

http://lists.wfu.edu/pipermail/gretl-devel/2015-December/006408.html

you can now give a default value of "null" for a matrix argument to 
a user-defined function. Illustration of usage:

<hansl>
function scalar foo (matrix m[null])
   return exists(m) ? tr(m) : NA
end function

eval foo(I(3))
eval foo()
eval foo(null)
</hansl>

Allin
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