How do I create a floating tikz figure when exporting to PDF in org-mode?

Question

With org-mode 8.2.10 on Emacs 24.5.1, the following will produce a ditaa figure in the exported PDF (LaTeX):

#+BEGIN_SRC ditaa :file foo.png :cmdline -E -s 4 -S
+---------+
| testing |
+---------+
#+END_SRC
#+CAPTION: ditaa caption
#+LABEL: fig:ditaa
#+attr_latex: :width 1in
#+RESULTS:
[[file:foo.png]]

If I try to do the same thing but using tikz to generate a figure, it does not work. The following example (copied from the org-mode documentation) simply produces a PDF containing the string "[[file:fsa.pdf]]".

#+begin_src latex :file fsa.pdf :packages '(("" "tikz")) :border 1em
  % Define block styles
  \usetikzlibrary{shapes,arrows}
  \tikzstyle{astate} = [circle, draw, text centered, font=\footnotesize, fill=blue!25]
  \tikzstyle{rstate} = [circle, draw, text centered, font=\footnotesize, fill=red!25]

  \begin{tikzpicture}[->,>=stealth', shorten >=1pt, auto, node distance=2.8cm, semithick]
    \node [astate] (1) at (0,0) {1};
    \node [astate] (2) at (1,0) {2};
    \node [rstate] (3) at (2,0) {3};
    \path (1) edge [bend left] node {b} (2)
          (2) edge node {b} (3)
          (2) edge [bend left] node {a} (1)
          (3) edge [loop above] node {(a, b)} (3);
  \end{tikzpicture}
#+end_src
#+CAPTION: tikz caption
#+LABEL: fig:tikz
#+RESULTS:
[[file:fsa.pdf]]

How do I generate a floating tikz figure without manually using \begin{figure}...\end{figure}?

Answer 1

They key is to add a :results raw header argument (documentation) to the #+BEGIN_SRC line to prevent org-mode from wrapping the results in #+BEGIN_LaTeX/#+END_LaTeX:

#+begin_src latex :file fsa.pdf :packages '(("" "tikz")) :border 1em :results raw
  % Define block styles
  \usetikzlibrary{shapes,arrows}
  \tikzstyle{astate} = [circle, draw, text centered, font=\footnotesize, fill=blue!25]
  \tikzstyle{rstate} = [circle, draw, text centered, font=\footnotesize, fill=red!25]

  \begin{tikzpicture}[->,>=stealth', shorten >=1pt, auto, node distance=2.8cm, semithick]
    \node [astate] (1) at (0,0) {1};
    \node [astate] (2) at (1,0) {2};
    \node [rstate] (3) at (2,0) {3};
    \path (1) edge [bend left] node {b} (2)
          (2) edge node {b} (3)
          (2) edge [bend left] node {a} (1)
          (3) edge [loop above] node {(a, b)} (3);
  \end{tikzpicture}
#+end_src
#+CAPTION: tikz caption
#+LABEL: fig:tikz
#+RESULTS:
[[file:fsa.pdf]]