I’m getting an “undefined control sequence” error with the following code, using TeXstudio:
\documentclass[11pt]{article}
\begin{document}
\begin{center}
\chapter{CHAPTER 6}
\end{center}
\end{document}
[Tex/LaTex] Undefined control sequence and \chapter error
sectioning
Related Solutions
I suggest that you redefine the chapter headings using the titlesec package. It is very advanced, but it is easy to make your requested changes.
Alternatively, you can use the less advance secsty package, but maybe you will not achieve your goal.
Another possibility is to replace your report-class with scrreprt from the KOMA-script-bundle. KOMAscript is a drop-in replacement for the standard class, but with the possibility to change headings etc. easily.
And finally, you can redefine the report class definition. At Vincent Zoonekynd homepage, you will find necessary code, for titles, for chapters and for sections.
Here is a modification of Zoonekynd's code that (hopefully) remove the word Chapter, put the number and the heading at the same line with a quad space in between, and then centre the heading. You have to modify the font size and space above and below yourself.
\documentclass{report}
\makeatletter
\def\@makechapterhead#1{%
\vspace*{10\p@}%
{\parindent \z@ \centering \reset@font
\par\nobreak
\vspace*{2\p@}%
{\Huge \bfseries \thechapter\quad #1\par\nobreak}
\par\nobreak
\vspace*{2\p@}%
%\vskip 40\p@
\vskip 100\p@
}}
\def\@makeschapterhead#1{%
\vspace*{10\p@}%
{\parindent \z@ \centering \reset@font
\par\nobreak
\vspace*{2\p@}%
{\Huge \bfseries #1\par\nobreak}
\par\nobreak
\vspace*{2\p@}%
\vskip 100\p@
}}
\makeatother
\begin{document}
\chapter{Introduction}
Test test
\end{document}
Update (needs KOMA-Script version 3.26b)
The original answer below is still correct. But there are the new command \RedeclareSectionCommands, the new options runin and afterindent. And there are some options predefined for new section levels using style=section.
Suggestion 1: Declaring new section level subsubsubsection as a displayed title
\documentclass{scrbook}
\DeclareNewSectionCommand[
style=section,
counterwithin=subsubsection,
afterskip=1.5ex plus .2ex,
beforeskip=3.25ex plus 1ex minus .2ex,
afterindent=false,
level=\paragraphnumdepth,
tocindent=10em,
tocnumwidth=5em
]{subsubsubsection}
\setcounter{secnumdepth}{\subsubsubsectionnumdepth}
\setcounter{tocdepth}{\subparagraphtocdepth}
\RedeclareSectionCommands[
level=\numexpr\subsubsubsectionnumdepth+1\relax,
toclevel=\numexpr\subsubsubsectiontocdepth+1\relax,
increaselevel
]{paragraph,subparagraph}
\RedeclareSectionCommand[
counterwithin=subsubsubsection,
tocindent=12em,
tocnumwidth=6em
]{paragraph}
\RedeclareSectionCommand[
tocindent=14em,
tocnumwidth=7em
]{subparagraph}
\usepackage{lipsum}% only for dummy text
\begin{document}
\tableofcontents
\chapter{Chapter}
\section{Section}
\subsection{Subsection}
\subsubsection{Subsubsection}
\subsubsubsection{Subsubsubsection}
\lipsum[1-2]
\end{document}
Suggestion 2: Redefining paragraph as a displayed title:
\documentclass{scrbook}
\RedeclareSectionCommand[
afterskip=1.5ex plus .2ex,
afterindent=false
]{paragraph}
\setcounter{secnumdepth}{\paragraphnumdepth}
\setcounter{tocdepth}{\paragraphtocdepth}
\usepackage{lipsum}% dummy text
\begin{document}
\tableofcontents
\chapter{Chapter}
\section{Section}
\subsection{Subsection}
\subsubsection{Subsubsection}
\paragraph{Paragraph}
\lipsum[1-2]
\end{document}
Original answer
You can declare a new section level subsubsubsection. But then you have to redeclare paragraph and subparagraph to adjust the its levels etc.:
\documentclass{scrbook}
\DeclareNewSectionCommand[
style=section,
counterwithin=subsubsection,
font=\normalsize,
afterskip=1.5ex plus .2ex,
beforeskip=-3.25ex plus -1ex minus -.2ex,
indent=0pt,
level=4,
tocstyle=section,
toclevel=4,
tocindent=10em,
tocnumwidth=5em
]{subsubsubsection}
\setcounter{secnumdepth}{\subsubsubsectionnumdepth}
\setcounter{tocdepth}{\subsubsubsectiontocdepth}
\RedeclareSectionCommand[
level=5,
counterwithin=subsubsubsection,
toclevel=5,
tocindent=12em,
tocnumwidth=6em
]{paragraph}
\RedeclareSectionCommand[
level=6,
toclevel=6,
tocindent=14em,
tocnumwidth=7em
]{subparagraph}
\usepackage{lipsum}% only for dummy text
\begin{document}
\tableofcontents
\chapter{Chapter}
\section{Section}
\subsection{Subsection}
\subsubsection{Subsubsection}
\subsubsubsection{Subsubsubsection}
\lipsum[1-2]
\end{document}
If do not use \paragraph as a runin title, you can redeclare section level paragraph using a positive value for afterskip:
\documentclass{scrbook}
\RedeclareSectionCommand[
afterskip=1.5ex plus .2ex,
beforeskip=-3.25ex plus -1ex minus -.2ex
]{paragraph}
\setcounter{secnumdepth}{\paragraphnumdepth}
\setcounter{tocdepth}{\paragraphtocdepth}
\usepackage{lipsum}% dummy text
\begin{document}
\tableofcontents
\chapter{Chapter}
\section{Section}
\subsection{Subsection}
\subsubsection{Subsubsection}
\paragraph{Paragraph}
\lipsum[1-2]
\end{document}
Best Answer
The
articleclass doesn't define the\chaptercommand, because articles don’t have chapters. Instead they have sections, subsections, etc. If you really want to usearticle, then you might want to consider using\section,\subsectionand so on.If you really want to use the
\chaptercommand, then I’d suggest using thebookorreportdocument classes.Separately, you generally shouldn’t use
\begin{center} … \end{center}for headings. It’s really better used to make lists or similar. A better way to centre your title headings is to use thetitlesecpackage, which is described in another question on TeX.se.