# Placing a label in specific corner of the chart

I plot two time series with pgfplots in one chart. I have a legend in the top right corner. Now, I would like to add a label (saying "Correlation = 0.86") in the top left corner. I have tried a lot with nodes, but I did not succeed in placing them in the top left corner. Is it possible to do that without using coordinates?

You can use the rel axis cs coordinate system to add nodes with labels (rel axis cs:0,0) is the lower left corner of the plot, and (rel axis cs:1,1) is the upper right corner of the plot. A little example:

\documentclass{article}
\usepackage{pgfplots}

\begin{document}

\begin{tikzpicture}
\begin{axis}
\node[anchor=north west] at (rel axis cs:0,1) {Correlation ${}= 0.86$};
\end{axis}
\end{tikzpicture}

\end{document}


To add the label outside the axis you'll need clip=false as axis option.

• Doesn't it make more sense to use rel axis cs? – Torbjørn T. Sep 9 '15 at 21:14
• Well, if one is after the top left corner, then I think it makes more sense, as you don't have to think about what the limits on the axes are. – Torbjørn T. Sep 9 '15 at 21:20
• @TorbjørnT. You're absolutely right! I had a mental lapsus. Will update immediately. Thnaks! – Gonzalo Medina Sep 9 '15 at 21:22

Another option is to give the axis environment a name, which you can refer to in the same way as other nodes.

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}[name=theaxis]
%\node[below left] at (rel axis cs:1,1) {Correlation${}= 0.86$};
\end{axis}
\node [below right] at (theaxis.north west) {Correlation${}= 0.86$};
\end{tikzpicture}
\end{document}