# Modify default memoir chapter style

I'm using memoir and using its default chapter style. what I'm looking to do is to change the format from

chapter 1

chapter title

to something like this:

chapter 1: chapter title

I'm new to LaTeX and I've been struggling with this all day reading manual and searching the net

EDIT: I forgot to mention that I would like the title to be centered as well

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Welcome to TeX.sx! No need to include 'thanks', simpliy upvote any good answers you may receive. –  Peter Jansson Feb 9 '13 at 10:01
thanks Peter :) –  M. Habib Feb 9 '13 at 10:04

\renewcommand{\chapnumfont}{\chaptitlefont}    % To harmonise the font sizes
\renewcommand{\chapnamefont}{\chaptitlefont}   % idem
\renewcommand{\afterchapternum}{:\quad}        % To set the line


(for example).

The macro \afterchapternum is called by memoir after setting 'Chapter n' and before setting 'This is my Chapter'.

The default value is this:

\def\afterchapternum{\par\nobreak\vskip \midchapskip}


The memoir manual describes this in §6.5, around pp 80-82.

Note: Added font harmonisation. My thanks to @lockstep.

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Many Thanks Brent... it works, but I had to remove the titlesec package that i was using for centering the all chapter titles... is there any workaround for this? –  M. Habib Feb 9 '13 at 10:59
@M.Habib There almost certainly is, but I'm afraid I can't research exactly how to do it right now, sorry. However, you might like to take a look at the various pre-defined chapter styles available in memoir -- try \chapterstyle{crosshead}, for example, in place of my answer. –  Brent.Longborough Feb 9 '13 at 11:16
Use \renewcommand{\chapnamefont}{\chaptitlefont\centering}. –  lockstep Feb 9 '13 at 11:46
Many thanks Brent and lockstep ... works perfectly now –  M. Habib Feb 9 '13 at 13:35

A possible solution:

\documentclass{memoir}
\usepackage{lipsum}

\makeatletter
\newcommand{\fonttitle}{\chaptitlefont}
\makechapterstyle{mystyle}{%
\def\printchaptername{}
\def\printchapternum{}
\def\printchapternonum{}
\def\printchaptertitle##1{\fonttitle \@chapapp\space \fonttitle \thechapter:\space \fonttitle ##1}
\def\afterchaptertitle{\par\nobreak\vskip \afterchapskip}
}
\makeatother

\chapterstyle{mystyle}

\begin{document}
\chapter{My chapter}
\lipsum

\chapter{Another chapter}
\lipsum
\end{document}


The result (page 1 for example):

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