Dear all,
the following example where S is an array of strings but a single entry
is 'null' triggers a crash of gretl (using current git on Ubuntu 16.10).
<hansl>
clear
matrix M = mnormal(2,2)
strings S = array(2)
S[1] = "col1"
colnames(M, S)
plot M
options with-lines time-series
end plot --output=display
</hansl>
Best,
Artur