How can I align my title to be flush with margin and format contents?

Question

I've had to alter my contents page to fit in with requirements for my thesis.

I need my chapter headings to read X.0 "chapter name". e.g. 1.0 Introduction

I've managed to do this using the title sec package, however it has caused a couple of new formatting issues that I can't fix. Here is the code:

\documentclass[12pt,a4paper]{report}

\linespread{1.3}
\usepackage{lscape}
\usepackage{graphicx}
\usepackage{placeins}
\usepackage{fixltx2e}
\usepackage{titlesec}

\renewcommand*{\thechapter}{\arabic{chapter}.0}
\renewcommand*{\thesection}{\arabic{chapter}.\arabic{section}}
\renewcommand*{\chaptername}

\titleformat{\chapter}[block]
 {\normalfont\huge\bfseries}{\chaptertitlename\ \thechapter}{20pt}{\Huge}

\begin{document}
\chapter{Introduction}
\section{section1}

\end{document}

My questions:

1. The title now sits slightly indented on the page e.g.

   1.0 Introduction

Is there a way to make it flush with the margin?

1. My contents now reads: 1.0Introduction etc.

Is there a way to create space between the number and the title?

Thanks in advance

Answer 1

Is this what you're looking for?

Code:

\documentclass[12pt,a4paper]{report}

\linespread{1.3}
\usepackage{lscape}
\usepackage{graphicx}
\usepackage{placeins}
\usepackage{fixltx2e}
\usepackage{titlesec}

\renewcommand*{\thechapter}{\arabic{chapter}.0}
\renewcommand*{\thesection}{\arabic{chapter}.\arabic{section}}

\titleformat{\chapter}[block]
 {\normalfont\huge\bfseries}{\thechapter}{20pt}{\Huge}

\begin{document}
\chapter{Introduction}
\section{section1}

\end{document} 

---

EDIT

To fix the ToC issue, you can load the package tocloft and put the following lines in the preamble:

\setlength{\cftchapnumwidth}{2.5em}
\setlength{\cftsecindent}{2.5em}
\setlength{\cftsubsecindent}{4.8em}

The first one gives more room for chapter numbers, the other ones are to reposition sections and subsections.

MWE:

\documentclass[12pt,a4paper]{report}

\linespread{1.3}
\usepackage{lscape}
\usepackage{graphicx}
\usepackage{placeins}
\usepackage{fixltx2e}
\usepackage{titlesec}
\usepackage{tocloft}

\renewcommand*{\thechapter}{\arabic{chapter}.0}
\renewcommand*{\thesection}{\arabic{chapter}.\arabic{section}}

\titleformat{\chapter}[block]
 {\normalfont\huge\bfseries}{\thechapter}{20pt}{\Huge}

\setlength{\cftchapnumwidth}{2.5em}
\setlength{\cftsecindent}{2.5em}
\setlength{\cftsubsecindent}{4.8em}

\begin{document}
\tableofcontents

\chapter{Introduction}
\section{section1}
\subsection{subsection1}


\end{document} 

Output (ToC):

Answer 2

\documentclass[12pt,a4paper]{scrreprt}
\addtokomafont{disposition}{\rmfamily}% delete for sans serif titles
\linespread{1.3}

\begin{document}
\chapter{Introduction}
\section{section1}
foo

\end{document}