title: gnuplot with texshop in osx
body: <p>I have installed gnuplot through macports but when i compile my latex document in texshop it doesn't show the plots and I get these errors in the log file:</p>
  
  <pre><code>Package pgf Warning: Plot data file `tutorial.x.table' not found. on input line
   17.
  
  
  Package pgf Warning: Plot data file `tutorial.sin.table' not found. on input li
  ne 19.
  
  
  Package pgf Warning: Plot data file `tutorial.exp.table' not found. on input li
  ne 21.
  </code></pre>
  
  <p>I'm just trying to compile this basic example:</p>
  
  <pre><code>% Author: Till Tantau
  % Source: The PGF/TikZ manual
  \documentclass{article}
  
  \usepackage[latin1]{inputenc}
  \usepackage{tikz}
  
  % GNUPLOT required
  \begin{document}
  \pagestyle{empty}
  
  
  \begin{tikzpicture}[domain=0:4]
      \draw[very thin,color=gray] (-0.1,-1.1) grid (3.9,3.9);
      \draw[-&gt;] (-0.2,0) -- (4.2,0) node[right] {$x$};
      \draw[-&gt;] (0,-1.2) -- (0,4.2) node[above] {$f(x)$};
      \draw[color=red] plot[id=x] function{x} 
          node[right] {$f(x) =x$};
      \draw[color=blue] plot[id=sin] function{sin(x)} 
          node[right] {$f(x) = \sin x$};
      \draw[color=orange] plot[id=exp] function{0.05*exp(x)} 
          node[right] {$f(x) = \frac{1}{20} \mathrm e^x$};
  \end{tikzpicture}
  
  
  \end{document}
  </code></pre>