Hi, see feature request #85 (by myself I must admit): https://sourceforge.net/p/gretl/feature-requests/85/ Currently a function with a list as a return type must internally set the names of the list members (series) and the those names are automatically exported to the function caller. If series with those names already exist in the outer scope (at the caller level), they would be overwritten. This is an exception of gretl's principle of function encapsulation. I'm suggesting: To provide a cleaner solution of this name clash problem, such a list-returning function should also accept a string array argument. The string elements in this array would be used by the function as the names of the exported list members. In this context it would be useful to have a built-in easy mechanism to take the labels from the string array and use it for the returned list (inside the user-defined function). That is the concrete request right now. I'm not suggesting to make this thing mandatory any time soon, because of the backward-compatibility issue. thanks, sven