%% Autor: X. Rendtel 
%% Letzte Aenderung: 23.11.2008
 
\documentclass[10pt, a4paper]{article}
\usepackage[utf8x]{inputenc}
\usepackage{euler,calc,pstricks,rotating,graphicx,multido}
\usepackage{pst-pdf,pst-node,xcolor,pst-circ,pst-func,pst-math,pst-eucl,pstricks-add}
\usepackage[greek,german]{babel}
\usepackage[LGR,T1]{fontenc}
\usepackage{mathpazo,avant,courier}
 
\makeatletter\newcommand{\psxpoint}[3][black]{%
  \psline[linewidth=.5pt]{-}(#2,\pst@xticksizeB)(#2,\pst@xticksizeA)
  \rput[t](! #2 \pst@number\pslabelsep \pst@number\pst@xticksizeB add
    \pst@number\psyunit div neg ){\color{#1}#3}}
\makeatother

\makeatletter\newcommand{\psypoint}[3][black]{%
  \psline[linewidth=.5pt]{-}(\pst@yticksizeB,#2)(\pst@yticksizeA,#2)
  \rput[r](! \pst@number\pslabelsep \pst@number\pst@yticksizeA sub
    \pst@number\psxunit div neg #2){\color{#1}#3}}
\makeatother
 
\newcommand{\EUR}{\textgreek{\euro}}
\pagestyle{empty}
\begin{document}
  
\psset{
 dotstyle = *, plotpoints=10000, 
 dotsize = 3pt,
 linewidth = 3pt,
 linecolor = black,
 arrowsize = 3pt 2,
 arrowinset = 0.25,
 xunit = 1cm,
 yunit = 1cm,
 algebraic = true} 
 
\begin{pspicture}(-6,-1.2)(7.2,17)
 
% Kariertes Papier wird erzeugt 
 \psgrid [
 xunit = 0.5,
 yunit = 0.5,
 gridwidth = 1pt,
 gridcolor = lightgray,
 griddots = 0,
 gridlabels = 0pt,
 subgriddiv = 0,
 subgridwidth = 0pt,
 subgridcolor = lightgray,
 subgriddots = 0]  
(0,0)(-12,0)(12,32) 
  
\uput[90](3.2,14){\LARGE \color{blue} $f_1$} 
\uput[90](2.2,14){\LARGE \color{green} $f_2$} 
\uput[90](1.2,14){\LARGE \color{red} $f_3$} 
% Ein Koordinatensystem wird gezeichnet 
\psaxes [
 comma,
 showorigin = false,
 Dx = 1,
 Dy = 1,
 dx = 0 pt,
 dy = 0 pt,
 Ox = 0,
 Oy = 0, 
linewidth = 2pt,
 linestyle = solid]{->}% 
(0,0) 
(-6,0) 
(6,16) 
\uput{0}[-90]{0}(6.2,-0.2){$x$} 
\uput{0}[0]{0}(0.2,16){$y$} 
 
% Ein Graph wird gezeichnet 
\psplot[
 linecolor = blue,
 linewidth = 1pt,
 linestyle = solid]% 
{-6.0000}{2.9970}{2*2^x} 
 
% Ein Graph wird gezeichnet 
\psplot[
 linecolor = green,
 linewidth = 1pt,
 linestyle = solid]% 
{-6.0000}{2.4084}{3*2^x} 
 
% Ein Graph wird gezeichnet 
\psplot[
 linecolor = red,
 linewidth = 1pt,
 linestyle = solid]% 
{-6.0000}{2.0000}{4*2^x} 
 
% Reinen Pstricks-Text schreiben 
\end{pspicture} 
\end{document}