Sectioning – Using Roman Numerals for Sections and Subsections

numberingroman numeralssectioning

I want to have my sections numbered using Roman numerals. However, I can only get the section number to be a Roman numeral, not the subsection. Here is some code:

\renewcommand{\thesection}{\Roman{section}} 
\renewcommand{\thesubsection}{\Roman{subsection}}

This will print, e.g. I. , whereas it should be I.I. Commenting out the second line gives the result I.1, which is not demanded.

Best Answer

You need to append the section number to the subsection number using:

\documentclass{article}
\renewcommand{\thesection}{\Roman{section}} 
\renewcommand{\thesubsection}{\thesection.\Roman{subsection}}
\begin{document}
\section{First section}
\subsection{First subsection}
\subsection{Second subsection}
\section{Second section}
\subsection{First subsection}
\subsection{Second subsection}
\end{document}

Section and subsection numbering

Related Solutions

[Tex/LaTex] Numbering subsections in one section only

If you change the document class from article to book or report, your document works without error. The code in your question uses the \chapter command which is undefined in the article class. Try:

\documentclass{book}
\setcounter{secnumdepth}{-1}
\begin{document}
\tableofcontents
\chapter{mwe}
\section{unnumbered subsections}
\subsection{unnumbered}
\section{roman numbered subsections}
\setcounter{secnumdepth}{2}
\renewcommand{\thesubsection}{\textnormal{\roman{subsection}}.}
\subsection{roman one}
\subsection{roman two}
\setcounter{secnumdepth}{-1}
\chapter{Second chapter}
\section{unnumbered subsections}
\subsection{unnumbered}
\end{document}

Sometimes it's good to use \addtocounter instead of \setcounter, so you could raise or lower the numbering level without using the absolute value.

Also, as you can see, I used the counter value -1 for not numbering chapters, instead of 0.

In general, I think it's a bit inconsistent to change the numbering depth within a document.

[Tex/LaTex] Roman numerals appear in toc but not in document

According to the manual of titlesec the command \titleformat* takes two arguments the section type/level and the format of the section. For the label you have to use \titleformat{command}[shape]{format}{label}{sep}{before code}[after code].

So you have to use something like the following

\renewcommand{\thesection}{\Roman{section}}
\titleformat{\section}
  {\Centering\normalsize\bfseries\uppercase}
  {\thesection. }
  {12pt}
  {}

to achieve the desired outcome.

Best Answer

Related Solutions

[Tex/LaTex] Numbering subsections in one section only

[Tex/LaTex] Roman numerals appear in toc but not in document

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