On Thu, 23 Jan 2020, Sven Schreiber wrote: Hmm. That was due to difficulties in translating between R and gretl types other than in the simplest of cases -- dim() returns a 2-vector of integers which does not register as a matrix via libR's Rf_isMatrix() function. That particular problem is now fixed in git, but there may be some others in the same neighbourhood. Allin