[pstricks] Trellis diagrams

[Carsten Vogel]

Am 29.01.2011 22:25, schrieb Per Ting:
> Is there an easy way to plot the trellis diagrams for convolutional
> codes using PStricks?

Okay, some minor changes, now I think it's acceptable:

http://imagebin.org/135142

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\documentclass[svgnames]{scrartcl}
\usepackage{pst-node}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{multido}

% provides replicate
\def\recur#1{\csname rn#1\recur} \long\def\rnm#1{\endcsname{#1}#1}
\long\def\rn#1{}
\def\replicate#1{\csname rn\expandafter\recur
   \romannumeral\number\number#1 000\endcsname\endcsname}

% provides guess what: a box!
\newcommand{\trbox}[1][00]{\psframebox{#1}}

% provides linestyles
\newpsstyle{tre}{arrows=->,nodesep=.2em,linecolor=Gray}
\newpsstyle{tdashed}{linestyle=dashed}
\newpsstyle{marked}{linecolor=Crimson,linewidth=2pt,nodesep=.2em,arrows=->}


\begin{document}
%\begin{pspicture}(-.8,-1)(8.8,3.8)
%\psframe[linecolor=Gray,linewidth=.7pt](-.8,-1)(8.8,3.8)

\begin{psmatrix}[colsep=3em,rowsep=1em]
	\replicate{4}{\trbox &}\trbox\\
	\replicate{4}{\trbox[01] &}\trbox[01]\\
	\replicate{4}{\trbox[10] &}\trbox[10]\\
	\replicate{4}{\trbox[11] &}\trbox[11]\\
\end{psmatrix}

\multido{\na=1+1,\nb=2+1}{4}{%
  	\ncline[style=tre]{1,\na}{1,\nb}
  	\ncline[style=tre]{2,\na}{1,\nb}
  	\ncline[style=tre]{3,\na}{2,\nb}
	\ncline[style=tre]{4,\na}{2,\nb}
	\ncline[style=tre,style=tdashed]{1,\na}{3,\nb}
	\ncline[style=tre,style=tdashed]{2,\na}{3,\nb}
	\ncline[style=tre,style=tdashed]{3,\na}{4,\nb}
	\ncline[style=tre,style=tdashed]{4,\na}{4,\nb}
}
	% check: line to  {[3|4],X} needs style=tdashed
	\ncline[style=marked]{1,1}{1,2}
	\ncline[style=marked,style=tdashed]{1,2}{3,3}
	\ncline[style=marked]{3,3}{2,4}
  	\ncline[style=marked,style=tdashed]{2,4}{3,5}
%\end{pspicture}
\end{document}