#+title: ECM
* black box model
This is a graphical representation of \(y=f(x)\):

#+header: :exports results
#+header: :results file raw
#+header: :file blackboxmodel.png
#+header: :imagemagick yes :iminoptions -density 600 :imoutoptions -geometry 400
#+header: :fit yes
#+header: :headers '("\\usepackage{tikz}")
#+begin_src latex
\begin{tikzpicture}[node distance=2cm, shorten >=2pt, shorten <=2pt]
  \node (x) {$x$};
  \node[fill=yellow!10!white,draw=white] (box) [right of=x] {Model} edge [<-] (x);
  \node (f) [right of=box] {$f(x)$} edge [<-] (box);
\end{tikzpicture}
#+end_src