section heading break new line

Question

i want to break my section heading in a new line.

\section{Underactuated mechanical systems \\ with servo constraints}

But the new line does not align with the first word Underactuated but align with the Section number 4.1. It looks not good.

\documentclass[
openright,
listof=totoc,
bibliography=totoc,
two‌side,
fontsize=12pt,
e‌nglish,
parskip=half,‌
headinclude,
footincl‌ude=false,
headseplin‌e,DIV17,
BCOR16mm,
num‌bers=noenddot,
2.1hea‌dlines,
appendixprefi‌x,
cleardoublepage=em‌pty]
{scrbook}

the formatting of section headings depends entirely on the document class, and you have given no clues about which document class you are using. — David Carlisle, Mar 06 '17 at 19:55
Thanks David. I am not very familiar with Latex. The template is just from the institute given for my phd Thesis. The document class is like this: \documentclass[openright,listof=totoc,bibliography=totoc,twoside,fontsize=12pt,english,parskip=half,headinclude,footinclude=false,headsepline,DIV17,BCOR16mm,numbers=noenddot,2.1headlines,appendixprefix,cleardoublepage=empty]{scrbook} — Peter Yang, Mar 06 '17 at 20:04
Possible duplicate of Chapter Section Subsection headings in one page alignment — gernot, Mar 07 '17 at 11:07

esdd · Answer 1 · 2017-03-07T09:54:03.207

Use \newline:

\documentclass{scrbook}
\begin{document}
\section
  [Underactuated mechanical systems with servo constraints]
  {Underactuated mechanical systems \newline with servo constraints}
\end{document}

Or you can redefine \sectionlinesformat to measure the width of the section number and use a \parbox for the section title text:

\documentclass{scrbook}
\newdimen\sectionnumberwidth
\newbox\sectionnumber
%\renewcommand\raggedsection{\raggedleft}
\makeatletter
\renewcommand\sectionlinesformat[4]{%
  \sbox\sectionnumber{\hskip#2#3}%
  \setlength\sectionnumberwidth{\wd\sectionnumber}%
  \@hangfrom%
    {\usebox\sectionnumber}%
    {\parbox[t]{\dimexpr\textwidth-\sectionnumberwidth\relax}{\raggedsection #4}}%
}
\makeatother
\begin{document}
\tableofcontents
\section
  [Underactuated mechanical systems with servo constraints]
  {Underactuated mechanical systems \\ with servo constraints}
\end{document}

BTW: Use DIV=17 and BCOR=16mm instead of the obsolete options DIV17 and BCOR16mm.

\documentclass[
%openright,% default
listof=totoc,
bibliography=totoc,
%twoside,% default
fontsize=12pt,
english,
parskip=half,
headinclude,
footinclude=false,
headsepline,
DIV=17,% <- changed
BCOR=16mm,% <- changed
numbers=noenddot,
headlines=2.1,% <- changed
appendixprefix,
%cleardoublepage=empty% default
]
{scrbook}

score 4 · Accepted Answer · answered Mar 06 '17 at 20:47

A solution that does not require to go into the details of scrbook is

\section
  [Underactuated mechanical systems with servo constraints]%
  {\parbox[t]{15em}{Underactuated mechanical systems with servo constraints}}

The optional argument is needed for the table of contents and page headings.

\documentclass[12pt]{scrbook}
\begin{document}
\setcounter{chapter}{4}
\section
  [Underactuated mechanical systems with servo constraints]%
  {\parbox[t]{15em}{Underactuated mechanical systems with servo constraints}}
\end{document}

@PeterYang Please unaccept my answer and accept the answer of esdd instead, it is definitely the better one. — gernot, Mar 07 '17 at 11:03

section heading break new line

2 Answers2