Otared Kavian schrieb am 22.06.2021 um 15:49:
Dear Dalyoung, dear Mikael

Thank you both for your explanations: indeed this « whatever » command in MetaPost is magic and very useful (I am not sure whether it is a command only in MetaFun, or it exists also in the original MetaPost).

You have to go further back, whatever already existed in MetaFont.

Wolfgang