Hi, I propose to overload the lags() function to accept not only a scalar lag value, but alternatively a vector/matrix where the elements specify which lags we want in the returned list. Here's a hansl function that does what I have in mind: function list getCertainLags( matrix idx, const list inp, bool bylag[0]) # returns a list with those lags of 'inp' specified by 'idx' elements idx = vec(idx) # ensure col vector list out = null loop i=1..rows(idx) lag = idx[i] list temp = lags(lag, inp, bylag) # watch out for the special case of lag 1 list templess1 = lag==1 ? null : lags( lag - 1, inp, bylag) list out = out || (temp - templess1) endloop return out end function And then I also have an unrelated and more fundamental feature suggestion: How about extending the foreach loop to also cover matrices and perhaps even arrays? So instead of the common thing: loop i=1..rows(inputvector) v = inputvector[i] ... one would do: loop foreach v inputvector ... and similarly for arrays. This is of course pure syntactic sugar -- and I also admit that this feels very pythonic, but I think it's not only present in Python. Don't know how difficult it would be to implement. After all, currently foreach is only for internal gretl strings. thanks, sven _______________________________________________ Gretl-devel mailing list Gretl-devel(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-devel

On Tue, 22 Sep 2015, oleg_komashko(a)ukr.net wrote: > Dear all, > I think it is a very good proposal. > Also, I find new functions > square() and seasonals() very useful > It would be nice to have a function creating > list of dummies for a discrete variable we have dummify() ------------------------------------------------------- Riccardo (Jack) Lucchetti Dipartimento di Scienze Economiche e Sociali (DiSES) Università Politecnica delle Marche (formerly known as Università di Ancona) r.lucchetti(a)univpm.it http://www2.econ.univpm.it/servizi/hpp/lucchetti ------------------------------------------------------- _______________________________________________ Gretl-devel mailing list Gretl-devel(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-devel