% \iffalse meta comment
% File: hhtensor.dtx Copyright (C) 2003 Harald Harders
% \fi
%
% \iffalse
%
%<*package>
\def\fileversion{0.6}
\def\filedate{2003/10/15}
\def\docdate{2003/10/15}
%</package>
%<*driver>
\listfiles
\documentclass[ngerman,english,a4paper]{ltxdoc}
\usepackage[T1]{fontenc}
%\usepackage{longtable}
\usepackage{mathcomp}
\usepackage{babel}
\IfFileExists{hhtensor.sty}{%
  \usepackage{hhtensor}
}{%
  \GenericWarning{hhtensor.dtx}{Package file hhtensor.sty not found
    (Documentation will be messed up!^^J^^A 
    Generate hhtensor.sty by (La)TeXing hhtensor.ins, process
    hhtensor.dtx again)^^J}\stop
}
\title{The \texttt{hhtensor} package\thanks{This file has version 
    \fileversion\ last revised \filedate, documentation dated
    \docdate.}}
\author{Harald Harders\\\texttt{h.harders@tu-bs.de}}
\date{File Date \filedate, Printed \today}
\newlength{\tempdima}%
\makeatletter
\renewenvironment{table}[1][]{%
  \@float{table}[#1]%
  \centering%
  \setlength{\tempdima}{\abovecaptionskip}%
  \setlength{\abovecaptionskip}{\belowcaptionskip}%
  \setlength{\belowcaptionskip}{\tempdima}%
  }{%
\end@float
}
\def\meta@font@select{\normalfont\itshape}
%%
\DeclareRobustCommand*\bvec[1]{\ensuremath{\boldsymbol{#1}}}
\DeclareRobustCommand*\bmatr[1]{\ensuremath{\boldsymbol{#1}}}
\DeclareRobustCommand*\btens[2]{\ensuremath{\boldsymbol{#1}}}
\DeclareRobustCommand*\uvec[1]{\ushort{#1}}
\DeclareRobustCommand*\umatr[1]{\ushortd{#1}}
\DeclareRobustCommand*\utens[2]{%
  \begingroup
  \setlength{\arraycolsep}{0pt}
  \begin{array}[t]{c}%
    #1 \\[-2.05ex]
    {\scriptstyle \sim} \\[-2.1ex]
    {\scriptscriptstyle #2}\\[-0.7ex]
  \end{array}%
  \endgroup
}
\makeatother
%%
\EnableCrossrefs
\CodelineIndex
\DoNotIndex{\def,\edef,\let,\newcommand,\newenvironment,\newcounter}
\DoNotIndex{\setcounter,\space,\if,\else,\fi,\empty,\@empty,\ifx,\fi}
\DoNotIndex{\ifnum,\fi,\expandafter,\csname,\endcsname,\the}
\DoNotIndex{\MessageBreak,\message,\newlength,\newif,\xdef,\newcount}
\DoNotIndex{\begingroup,\endgroup,\,,\@tempcnta,\@tempdima,\advance}
\DoNotIndex{\ensuremath,\filedate,\fileversion,\docdate}
\DoNotIndex{\mathit,\mathrm,\mathsf,\nprt@tmp,\nprt@tmpnum,\relax}
\DoNotIndex{\protect,\renewcommand,\setlength,\settowidth,\stepcounter}
\DoNotIndex{\string,\DeclareRobustCommand,\\}
\CodelineNumbered
\RecordChanges
%\CheckSum{1016}
\begin{document}
 \DocInput{hhtensor.dtx}
\end{document}
%</driver>
% \fi
%
% \changes{0.6}{2003/10/15}{Total new implementation}%
%
% \maketitle
% \begin{abstract}
% \noindent
% This package provides commands for vectors, matrices, and tensors
% with different styles (arrows as the \LaTeX\ default, underlined,
% and bold).
% \end{abstract}
%
% \tableofcontents
%
% \section*{Copyright}
%
% Copyright 2003 Harald Harders.
%
% This program can be redistributed and/or modified under the terms
% of the LaTeX Project Public License Distributed from CTAN
% archives in directory macros/latex/base/lppl.txt; either
% version 1 of the License, or any later version.
%
%
% \section{Load the package}
%
% To use this package place
% \begin{quote}
% |\usepackage|\oarg{style}\marg{hhtensor}
% \end{quote}
% in the preamble of your document.
% The \meta{style} is |arrow|, |bold|, or |uline| for arrow style,
% bold symbols, resp.\ underlined symbols.
% Default is |arrow|.
%
%
% \section{Usage}
%
% \DescribeMacro{\vec}
% Vectors are printed as usual using the \cs{vec\marg{symbol}}
% command.
% Depending on the style, they are printed $\vec{\alpha}$,
% $\bvec{\alpha}$, resp.\ $\uvec{\alpha}$.
%
% \DescribeMacro{\matr}
% Matrices are printed using \cs{matr\marg{symbol}}: $\matr{\alpha}$,
% $\bmatr{\alpha}$, resp.\ $\umatr{\alpha}$.
%
% \DescribeMacro{\tens}
% Tensors are a little bit different.
% They take two arguments while the first one is the symbol, while the
% second is the step: \cs{tens\marg{symbol}\marg{step}}.
% This leads to $\tens{\alpha}{4}$, $\btens{\alpha}{4}$, resp.\
% $\utens{\alpha}{4}$.
%
% In the bold style, it is not distinguished between vectors,
% matrices, and tensors.
% I would like to use upright symbols but then you cannot use all
% symbols because there is no full upright bold math alphabet.
%
% \DescribeMacro{\dcdot}
% The \cs{dcdot} command produces a double dot for double scalar
% products, e.g.,
% $\matr{\sigma}=\tens{A}{4}\dcdot\matr{\varepsilon}$.
%
% \DescribeMacro{\trans}
% \cs{trans} produces a transponed sign: $\matr{A}\trans = \matr{B}$.
%
%
% \StopEventually{\PrintChanges \PrintIndex}
%
% \section{The implementation}
% \iffalse
%<*package>
% \fi
% Heading of the package:
%    \begin{macrocode}
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{hhtensor}[\filedate\space v\fileversion\space
  Print numbers]
\message{Package `hhtensor', Version \fileversion\space of \filedate.}
%    \end{macrocode}
% |ushort| underlines with shorter lines than \cs{underline}.
%    \begin{macrocode}
\RequirePackage{ushort}
%    \end{macrocode}
% |amsmath| for bold symbols.
%    \begin{macrocode}
\RequirePackage{amsmath}
%    \end{macrocode}
% Booleans to decide which version has to be used.
%    \begin{macrocode}
\newif\iftensor@bold
\newif\iftensor@uline
%    \end{macrocode}
% Package options that set the booleans.
%    \begin{macrocode}
\DeclareOption{bold}{\tensor@boldtrue\tensor@ulinefalse}
\DeclareOption{uline}{\tensor@boldfalse\tensor@ulinetrue}
\DeclareOption{arrow}{\tensor@boldfalse\tensor@ulinefalse}
%    \end{macrocode}
% Default are arrows, as in standard \LaTeX.
%    \begin{macrocode}
\ExecuteOptions{arrow}
\ProcessOptions\relax
%    \end{macrocode}
% \begin{macro}{\origvec}
% Save the original \cs{vec} command.
%    \begin{macrocode}
\newcommand\origvec{}
\let\origvec=\vec
%    \end{macrocode}
% \end{macro}
% If bold vectors and tensors are requested, execute this code.
%    \begin{macrocode}
\iftensor@bold
%    \end{macrocode}
% \begin{macro}{\vec}
% Redefine the \cs{vec} command.
%    \begin{macrocode}
  \DeclareRobustCommand*\vec[1]{\ensuremath{\boldsymbol{#1}}}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\matr}
% Defined the \cs{matr} command.
%    \begin{macrocode}
  \DeclareRobustCommand*\matr[1]{\ensuremath{\boldsymbol{#1}}}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\tens}
% Defined the \cs{tens} command.
%    \begin{macrocode}
  \DeclareRobustCommand*\tens[2]{\ensuremath{\boldsymbol{#1}}}
%    \end{macrocode}
% \end{macro}
% Underlined vectors?
%    \begin{macrocode}
\else
  \iftensor@uline
%    \end{macrocode}
% \begin{macro}{\vec}
% Vectors underlined.
%    \begin{macrocode}
    \DeclareRobustCommand*\vec[1]{\ushort{#1}}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\matr}
% Matrices double underlined.
%    \begin{macrocode}
    \DeclareRobustCommand*\matr[1]{\ushortd{#1}}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\tens}
% Tensors with number of step below.
%    \begin{macrocode}
    \DeclareRobustCommand*\tens[2]{%
      \begingroup
        \setlength{\arraycolsep}{0pt}
        \begin{array}[t]{c}%
          #1 \\[-2.05ex]
          {\scriptstyle \sim} \\[-2.1ex]
          {\scriptscriptstyle #2}\\[-0.7ex]
        \end{array}%
      \endgroup
    }
%    \end{macrocode}
% \end{macro}
% Vectors with an arrow.
% Since this is the default, the \cs{vec} command has not to be
% redefined.
%    \begin{macrocode}
  \else
%    \end{macrocode}
% \begin{macro}{\matr}
% Matrix.
%    \begin{macrocode}
    \DeclareRobustCommand*\matr[1]{\ensuremath{\vec{\vec{#1}}}}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\tens}
% Tensors with number of step below.
% That does not fit well to the arrow styles, but I don't know a
% better solution.
% Does somebody have one?
%    \begin{macrocode}
    \DeclareRobustCommand*\tens[2]{%
      \begingroup
        \setlength{\arraycolsep}{0pt}
        \begin{array}[t]{c}%
          #1 \\[-2.05ex]
          {\scriptstyle \sim} \\[-2.1ex]
          {\scriptscriptstyle #2}\\[-0.7ex]
        \end{array}%
      \endgroup
    }
%    \end{macrocode}
% \end{macro}
%    \begin{macrocode}
  \fi
\fi
%    \end{macrocode}
% \begin{macro}{\dcdot}
% Double scalar product.
%    \begin{macrocode}
\DeclareRobustCommand*\dcdot{\mathrel{\cdot\mkern 0.0mu \cdot}}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\trans}
% Transformed sign.
%    \begin{macrocode}
\DeclareRobustCommand*\trans{^{\mathrm{T}}}
%    \end{macrocode}
% \end{macro}
%
% \iffalse
%</package>
% \fi
% \Finale

