Hi all, I am not sure whether the following is actually intended or not. The help does not mention any limits, though. For a project, I stumbled over the following: 1. Create a matrix of residuals with NAs as initial values. 2. Name the columns of the matrix. 3. Store the columns of the matrix as series using the mat2list() function. In my case, I did not pass any prefix as a 2nd optional argument to mat2list(). The names of the matrix columns are the same as _already_ existing series. This implies that the application of mat2list() over-writes existing series values. It took me a while to understand what's going on and where the error in my code is. Questions: Is it intended (the help does not state anything explicitly) that mat2list() is allowed to overwrite values of some existing series? If so, I think it's useful to provide a warning for the user, stating that values of some series are over-written. What do you think? Here is an example: <hansl> set verbose off clear open denmark -q list L = dataset scalar popt = 4 var popt L --silent # Store residuals ## take into account the NA values for the initial obs. smpl +popt ; matrix uhat = $uhat ## name the residuals equal to the original input series cnameset(uhat, varnames(L)) ## add the named residuals to the dataset list Comps = mat2list(uhat) smpl full # as can be seen: the residuals and original series are mingled print Comps -o --range=1:10 </hansl> Thanks Artur