[Gretl-users] question concerning panel-matrix operation

Hi there, I've got a panel and with the diff command one can easily get the first difference of a particular variable. Then there is at least one missing value in the new series. Via the GUI it it possible to produce a matrix out of the row that automatically drops the missing line - cool! My question is whether there exists a command for that operation? (The log stays empty). Best regards Pindar