[tex-eplain] Definition with an optional argument

Rodolfo Medina rodolfo.medina at gmail.com
Sun Apr 5 19:03:03 CEST 2009

Hi all.

In a certain two-argument definition, I wish that the second argument was
optional, i.e. if it's not there it is like it didn't exist at all in the

I don't understand well the use of \@getoptionalarg and \@optionalarg as
explained in eplain manual.

Can anybody please provide a clearer example of how I can make one of my two
arguments optional using \@getoptionalarg and \@optionalarg?

Thanks for any help

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