[Pgfplots-features] enlarge x limits in groupplot and multiple symbols in legend

[Florian L. <mai...@xg...>]

Hello,

I have a plot, generated from the two tiny data files I have attached. It basically works great, with two small issues:

* enlarge x limits seems to have only an effect on the first group plot. I also tried putting it in \nextgroupplot[here], but same effect.

* The legend contains two symbols (of the same color) for each entry, like "☐ ☐ Filling evaluation". How can I omit the second symbol?

Thanks a lot!
Florian

\begin{figure}
  \centering
  \ref{leg:TimingsPreallocation}
  \begin{tikzpicture}
    \begin{groupplot}[
      group style={columns=2, y descriptions at=edge left},
      ybar={0cm},
      symbolic x coords={off, compute, save, tree},
      xtick=data,
      xticklabels={No preallocation, Explicitly computed, Computed \& saved, Spatial tree},
      /pgf/bar width=9pt,
      enlarge x limits=0.18, enlarge y limits={value=0.3, lower}, 
      ymode=log,
      ylabel={Time [ms]},
      x tick label style={rotate=30},
      ymax=40000,
      legend entries={Filling evaluation, Preallocation evaluation, Filling interpolation, Preallocation interpolation},
      legend to name={leg:TimingsPreallocation}, legend columns=2]
      
      \nextgroupplot
      \addplot+ table[y=fillA]{prealloc-80.csv};
      \addplot+ table[y=preallocA]{prealloc-80.csv};
      \addplot+ table[y=fillC]{prealloc-80.csv};
      \addplot+ table[y=preallocC]{prealloc-80.csv};

      \nextgroupplot
      \addplot+ table[y=fillA]{prealloc-100.csv};
      \addplot+ table[y=preallocA]{prealloc-100.csv};
      \addplot+ table[y=fillC]{prealloc-100.csv};
      \addplot+ table[y=preallocC]{prealloc-100.csv};
    \end{groupplot}
  \end{tikzpicture}
\end{figure}