[Gretl-users] Error with recent snapshot when using gnuplot command with factors

Hi all, I'm encountering an error with the recent gretl snapshot (v2025c) related to the gnuplot command. The problem arises when using some options like --dummy and/or --factorized with discrete series. By the way, I realized that the --dummy option is not documented anymore(?) (I am pretty sure it was listed in the past). Probably, this option got superseded by the --factorized option recently (see below). Below is a minimal example illustrating the issue: <hansl> set verbose off open mrw.gdt --quiet # "OECD" is a discrete series (see series attributes) # Note: The following "works" technically, but only 3 data points are shown! # This used to work in the past: gnuplot gdpgrow school OECD --dummy --output=display # This works without error, but again only 3 instead of 121 points are shown gnuplot gdpgrow school OECD --factorized --output=display # This returns an error "Invalid argument": gnuplot gdpgrow school OECD --factorized=OECD --output=display # After executing the above line, the following also fails with "Invalid argument" # even though it worked before: gnuplot gdpgrow school OECD --factorized --output=display </hansl> This may be connected to the recent update in version 2025b according to the changelog: <> 2025-06-05 Version 2025b - "gnuplot" command: generalize the --dummy functionality for factorized plots; update and improve the help text </> I am working under Ubuntu and have gnuplot version 6.0 patchlevel 2 installed Do you guys face the same error? Artur