Btukfyl

I would like to have section titles with runin so that there is no newline after the section title. This can be done with

documentclass{article}

usepackage{titlesec}

title{section}[runin]{large}{thesection}{1em}{}

begin{document}

    section{First section}

     This text follows on the same line as "First section"

end{document}

However, I am using the KOMA scrartcl class and use of the titlesec package is discouraged (see Incompatibilities between KOMA-Script and titlesec).

I have searched through the KOMA-Script documentation, but cannot find anything like the runin option in titlesec. How can I achieve this functionality while using a KOMA-Script class?

1 Older version of KOMAScript

You have to redefine the definition of section, subsection etc. You use a negativ values to set runin heading, like in the standard article-class. I have copied the definition of headings from scrartcl sometimes in the past. Be aware that this solution may break if scrartclis changed.

If you take a look at page 351 in the English manual for Komascript, you will see that there are several commands for changing the space above and below chapterand part. Hopefully, we will see a similar command for section and her sisters.

Here, I have redefined both section and subsection to be runin-header.

documentclass{scrartcl}



makeatletter

renewcommandsection{@startsection{section}{1}{z@}%

    {-1.5ex}%

    {-1em}%{2.3ex @plus.2ex}% < - negative value here negative value here, 

                             % the values behind % are the original.

                             % no use for rubber values, use a fix value to set the

                             % distance to between heading and the text 

    {ifnum scr@compatibility>@nameuse{scr@v@2.96}relax

    setlength{parfillskip}{z@ plus 1fil}fi

    raggedsectionsectfontnobreaksize@section}%

  }



renewcommandsubsection{@startsection{subsection}{1}{z@}%

  {-1.5ex @plus -1ex @minus -.2ex}%

  {-1em}%{2.3ex @plus.2ex}% <- negative value here, the values behind % are the original

  {ifnum scr@compatibility>@nameuse{scr@v@2.96}relax

    setlength{parfillskip}{z@ plus 1fil}fi

    raggedsectionnormalfontsectfontnobreaksize@section}%

    }

makeatother



begin{document}

    section{First section}

     This text follows on the same line as "First section"

end{document}

You use the ordinary addtokomafont etc. to change the font, colour etc. ANd of course, you have to fiddle around with the figures to get the space above you prefer.

2. Never versions of KOMAScript

I refer to Johannes_B’s answer below.

For the sake of completeness, I will bring your attention to page 363 ff. in the English KOMAScript manual as of 2015-10-03. The author has (from version 3.16?) added the possibility to interface to section{} and her sisters by the four commands:

DeclareSectionCommand[attributes]{name}

DeclareNewSectionCommand[attributes]{name}

RedeclareSectionCommand[attributes]{name}

ProvideSectionCommand[attributes]{name}

You may use this commands to define totally new sectioning commands, but also to redefine the existing ones, including the possibility to easily define the section{}-command to be a run-in heading.

RedeclareSectionCommand[%

afterskip=-10pt plus -1sp minus 1sp% using rubber is optional 

]{section}

Just use a negative value as the first afterskip value ( I have used -10pt here).

The author of KOMA-script added an easy to use interface to redeclare sectioning commands (chapters and parts as well). In my opinion, it is much simpler than using titlesec ;-)

Of course, you need a fairly recent KOMA-bundle.

documentclass{scrartcl}

RedeclareSectionCommand[afterskip=-1em,%negative value -> runin

font=largenormalfont%match the font of your example

]{section}

begin{document}

section{First section}

This text follows on the same line as "First section"

end{document}

As from v3.26, one may also use the switch runin.

RedeclareSectionCommand[runin=on]{section}