# how to change chapter/section style in tufte-book?

i used this code but there is an error:

## ! Use of \@ doesn't match its definition.

I'm trying to make my book such as:

‎\documentclass[a4paper,14pt,twoside]{tufte-book}‎
\usepackage{amsthm,amssymb,amsmath}‎

‎\usepackage{graphicx‎ ,‎xcolor‎ ,‎mdframed}‎
‎‎\usepackage[version=0.96]{pgf}‎

%‎\input{mystyle}‎
‎
\setcounter{secnumdepth}{3}
‎\usepackage{color‎}‎
‎\def\chpcolor{blue!45}‎
‎\def\chpcolortxt{blue!60}‎

%Section: ---------------------------------------------------------------------------------
‎   { \vspace{20pt}‎
‎   \parindent 0pt \raggedleft \sectionfont‎
\colorbox{\chpcolor} { \parbox[c][17pt][c]{90pt}{\color{white} \hfill \thesection‎ }}
‎   \hspace*{5pt}‎
‎   \vspace{10pt}‎
‎   \begin{minipage}[c][17pt][c]{\textwidth}‎
‎   \color{\chpcolortxt} #1‎
‎   \end{minipage}‎
‎   }‎
}
‎\def\section{\@afterindentfalse \secdef\@section\@ssection}‎
‎\def\@section[#1]#2{\ifnum \c@secnumdepth >\m@ne‎
‎\refstepcounter{section}‎
‎\numberline{\thesection}#1}\else‎
‎\sectionmark{#1}‎

‎

‎\begin{document}‎
‎‎\chapter{chapter}‎‏‎
This ‎is ‎test.‎
‎‎\section{section}‎‎
This ‎is ‎test.‎
‎\end{document}‎

-
Welcome to TeX.SE. There seem to be some extra characters in this file that won't let me compile your code. –  Peter Grill Nov 17 '12 at 6:12
What Should I Do? –  mohammad azadi Nov 17 '12 at 7:16
Sorry, wish I could help, but I don't know why those characters are there, and compiling gets stuck on \documentclass. If I retype the \documentclass line, then the problem moves to the next line. There was a recent question where a similar problem existed: LaTeX Error: Missing \begin{document}. Have a look at that and see if that helps you with these characters. –  Peter Grill Nov 17 '12 at 7:19
When i remove this lines: %Section: ---------\def\@makesectionhead#1{‎ ... \fi}‎ compile successfully. but i want to change color and style of chapters and sections and ..., can you help me? –  mohammad azadi Nov 17 '12 at 7:30
Try rewriting this with another editor which does not add invisible characters. –  Vafa Nov 17 '12 at 8:18

After removing all the invisible characters from your input, there are still some problems. For instance, in order to use commands with @ in their name, you have to surround the code with \makeatletter and \makeatother.

I have tried to correct the small problems of your code; here is a version with only the needed packages. I tried to guess the meaning of \sectionfont.

\documentclass[a4paper,twoside]{tufte-book}

\usepackage{xcolor}

\def\chpcolor{blue!45}
\def\chpcolortxt{blue!60}
\def\sectionfont{\sffamily\LARGE}

\setcounter{secnumdepth}{2}

\makeatletter
%Section:
\def\@sectionstrut{\vrule\@width\z@\@height12.5\p@}
{\par\vspace{20pt}%
\parindent 0pt\raggedleft\sectionfont
\colorbox{\chpcolor}{%
\parbox[t]{90pt}{\color{white}\@sectionstrut\@depth4.5\p@\hfill
\ifnum\c@secnumdepth>\z@\thesection\fi}%
}%
\begin{minipage}[t]{\dimexpr\textwidth-90pt-2\fboxsep\relax}
\color{\chpcolortxt}\@sectionstrut\hspace{5pt}#1
\end{minipage}\par
\vspace{10pt}%
}
}
\def\section{\@afterindentfalse\secdef\@section\@ssection}
\def\@section[#1]#2{%
\ifnum\c@secnumdepth>\m@ne
\refstepcounter{section}%
\else
\phantomsection
\fi
\sectionmark{#1}%
\if@twocolumn
\else
\fi
}
\def\@ssection#1{%
\if@twocolumn
\else
\fi
}
\makeatother

\begin{document}
\chapter{Chapter title}
This is a test.

\section{The Laplace transform}
This is a test.

\end{document}


-
Thank you. This is very good. –  mohammad azadi Nov 18 '12 at 5:14
How to change chapter style same as section? –  mohammad azadi Nov 19 '12 at 13:35
@mohammadazadi see the related follow-up question: tex.stackexchange.com/questions/96090/… –  cmhughes Jan 31 '13 at 16:30
If I'm writing an article the section style can work? I've tried it but I couldn't manage it! –  giannis Apr 9 '13 at 21:05