\begin{juliacode}
using Gadfly
x = range(0, stop =2π, step=0.05)
plot(x=x, y = sin.(x), Geom.line)
\end{juliacode}
\begin{figure}[ht]
\center
\includegraphics[width=\linewidth]{figures/gadfly_formats_test_sin_fun_1.pdf}
\caption{sin(x) function.}
\label{fig:sin_fun}
\end{figure}

\begin{figure}[htpb]
\center
\includegraphics[width=\linewidth]{figures/gadfly_formats_test_2_1.pdf}
\caption{cos(x) function.}
\end{figure}

\begin{juliacode}
plot(x=x, y = cos.(2x), Geom.line)
\end{juliacode}
\includegraphics[width=15cm]{figures/gadfly_formats_test_cos2_fun_1.pdf}