\documentclass[tikz]{standalone}

\usepackage{libertine}
\usepackage{pgfplots}
\usepgfplotslibrary{statistics}

\newcommand{\basename}{../output/figures/fig_11/box_and_cone}

\begin{document}

\begin{tikzpicture}
  \begin{axis}[
    xlabel = {\large number of contacts},
    ylabel = {\large pruning threshold},
    ytick={1, 2, 3, 4},
    yticklabels={0.5, 0.34, 0.17, 0},
    ]
    \addplot+ [boxplot] table [y index=2] {\basename_0_50/log.txt};
    \addplot+ [boxplot] table [y index=2] {\basename_0_34/log.txt};
    \addplot+ [boxplot] table [y index=2] {\basename_0_17/log.txt};
    \addplot+ [boxplot] table [y index=2] {\basename_0_00/log.txt};
    % \addlegendentry{\huge analytical}
  \end{axis}
\end{tikzpicture}

\begin{tikzpicture}
  \begin{semilogxaxis}[
    xlabel = {\large solver iterations},
    % ylabel = {\large pruning thresholds},
    ytick={1, 2, 3, 4},
    yticklabels={},
    filter discard warning=false,
    ]
    \addplot+ [boxplot] table [y index=15] {\basename_0_50/log.txt};
    \addplot+ [boxplot] table [y index=15] {\basename_0_34/log.txt};
    \addplot+ [boxplot] table [y index=15] {\basename_0_17/log.txt};
    \addplot+ [boxplot] table [y index=15] {\basename_0_00/log.txt};
    % \addlegendentry{\huge analytical}
  \end{semilogxaxis}
\end{tikzpicture}

\end{document}