Re: [Gretl-devel] some questions on null keyword

Dear Allin, I didn't have any opinion on it. That's why I asked. I do not see any contradictions there. Oleh 27 жовтня 2015, 23:07:38, від "Allin Cottrell" < cottrell(a)wfu.edu >: On Tue, 27 Oct 2015, oleg_komashko(a)ukr.net wrote: Thanks, that's helpful! Note, the output from the above is: <output> ? nulldata 1 periodicity: 1, maxobs: 1 observations range: 1 to 1 ? list nlist = null Generated list nlist ? z = isnull(varname(nlist)) Generated scalar z = 1 ? z 1 Done </output> Well, it's certainly an oddity but it is legal, and if you think it through it is consistent with the documentation for isnull(). The expression "varname(nlist)" produces an empty string -- in conformity with its documentation, since nlist is empty. But the empty string is not the name of any existing variable, so isnull(<empty string>) correctly returns 1 (!). Allin _______________________________________________ Gretl-devel mailing list Gretl-devel(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-devel