Numbering

[Jürgen Spitzmüller]

Am Dienstag, dem 08.02.2022 um 02:55 +0200 schrieb Joseph Hesse via
lyx-users:
> My lyx document is a book with chapters in a master document.  I add 
> computer program listings, from files in other folders, with 
> Insert->File->Child Document->Program Listing.  This works well for
> me.
> 
> The numbering of the program listings is 2.1, 2.2, 2.3, etc. where
> the 2 
> is the chapter and the number after the dot is a counter that keeps 
> incrementing after a new listing is added.  I would like to change
> this 
> so the numbering is Chapter.Section.Counter e.g. 2.2.1, 2.2.2, 2.2.3 
> where these are listings in chapter 2, section 2.
> 
> How do I do this?  Please point me to a package that will help me 
> implement this.

\usepackage{chngcntr}
\AtBeginDocument{\counterwithin{lstlisting}{section}}

See
https://tex.stackexchange.com/a/238843

HTH,
Jürgen

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