This relates to Sven's posting at http://lists.wfu.edu/pipermail/gretl-devel/2017-January/007220.html I'm working on getting the "member-of" relation to recurse, as it ideally should, in "genr" expressions. The simpler task is to get this right on the right-hand side of an assignment, and I think I've made some progress. Here's an example of a script that would not have (fully) worked before, but now should, in git: <hansl> matrices M = array(1) M[1] = seq(1,3) # array -> matrix -> element eval M[1][2] bundle b b.mat = seq(1,3) # bundle -> matrix -> submatrix eval b.mat[2:3] bundles B = defarray(b) # array -> bundle -> matrix: OK eval B[1].mat # array -> bundle -> matrix -> element eval B[1].mat[3] bundle c c.B = B # bundle -> array -> bundle -> matrix -> submatrix eval c.B[1].mat[,-2] </hansl> It would be good to have the same sort of thing working on the left-hand side (assignment to an arbitrarily nested member of a compound object). We're not there yet but I'm hopeful... Stay tuned. Allin