chapterssectioning
I am wondering how to change the chapter style to the following format?
I tried using titlesec package but couldn't figure out how to create this format.
\documentclass[reqno,12pt,oneside]{report}
\usepackage{titlesec}
\begin{document}
\chapter{introduction}
\end{document}
Thanks in advance
The use of the [explicit] option to titlesec forces the user to input #1 for the title format. You'll note a reference to \LARGE#1 within the definition of \titleformat for \chapter (both). Adjust this to suit your needs.
Below I've updated the font reference so you can (re)define \chaptertitlefont:
\documentclass{book}
\usepackage[explicit]{titlesec}
\usepackage{lmodern,lipsum}
\newlength\chapnumb
\setlength\chapnumb{4cm}
\newcommand{\chaptertitlefont}{\normalfont\sffamily\Huge}
\titleformat{\chapter}[block]
{\normalfont\sffamily}{}{0pt}
{\parbox[b]{\chapnumb}{%
\fontsize{120}{110}\selectfont\thechapter}%
\parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{%
\raggedleft%
\hfill{\chaptertitlefont#1}\\
\rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt}}}
\titleformat{name=\chapter,numberless}[block]
{\normalfont\sffamily}{}{0pt}
{\parbox[b]{\chapnumb}{%
\mbox{}}%
\parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{%
\raggedleft%
\hfill{\chaptertitlefont#1}\\
\rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt}}}
\begin{document}
\chapter*{A Long Title for an Unnumbered Test Chapter}
\lipsum[4]
\chapter{Introduction}
\lipsum[4]
\end{document}
The above changes the font to \Huge. If you want larger font sizes, see Fonts larger than \Huge?
Elaborating @Bernard comments, use titlesec package for formatting titles of chapters.
I give you a full example.
\documentclass[12pt]{report}
\usepackage[utf8]{inputenc}
\usepackage{geometry}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{booktabs,makecell,longtable}
\usepackage[T1]{fontenc}
\graphicspath{{images/}}
% I have added this
\usepackage[explicit,compact]{titlesec}
\titleformat{\chapter}[block]
{\bfseries\huge}{\filright\huge\thechapter.}{1ex}{\huge\filright #1}
\title{}
\author
{}
\date{}
\begin{document}
\maketitle
\chapter*{Abstract}
\chapter{Introduction}
%\input{Chapters/Introduction}
...........
\chapter{Conclusion}
%\input{Chapters/Conclusion}
\chapter{Reference}
%\input{Chapters/Reference}
\end{document}
Here in the code:
% I have added this
\usepackage[explicit,compact]{titlesec}
\titleformat{\chapter}[block]
{\bfseries\huge}{\filright\huge\thechapter.}{1ex}{\huge\filright #1}
\huge can change the font size.
\filright can change the orientation.
Best Answer
Possible solution using
titlesec: