Coordinates of an Intersection, outside of the axis-environment

Question

I would like to access the x- and y-Coordinate of an intersection, outside of the axis environment. This is what I believed would solve my problem, based on this and this:

\documentclass{article}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16}
\usetikzlibrary{calc}

\begin{document}

\begin{tikzpicture}
\begin{axis}%[xmin=0,xmax=1]
\addplot [color=blue, mark=none,domain=0:1, name path global=blau] {x};
\addplot [color=red, mark=none,domain=0:1, name path global=rot] {1-x};
\path [name intersections={of=blau and rot,by=inter}];
\path let \p1=(inter) in node[] () at (\x1,\y1);
\end{axis}

\node[color=black] () at (\x1, 0) {Access Demonstration x};
\node[color=black] () at (0, \y1) {Access Demonstration y};

\end{tikzpicture}

\end{document}

Thank you for your help.

score 2 · Accepted Answer · answered Nov 09 '18 at 14:03

You need to load intersections and no, this method won't work since \x1 and \y1 are not known where you want to use them. However, there is an even simpler way.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{intersections}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16}
\usetikzlibrary{calc}

\begin{document}

\begin{tikzpicture}
\begin{axis}%[xmin=0,xmax=1]
\addplot [color=blue, mark=none,domain=0:1, name path global=blau] {x};
\addplot [color=red, mark=none,domain=0:1, name path global=rot] {1-x};
\path [name intersections={of=blau and rot,by=inter}];

\end{axis}

\node[color=black] () at (inter|-0,0) {Access Demonstration x};
\node[color=black] () at (inter-|0,0) {Access Demonstration y};

\end{tikzpicture}

\end{document}

So what is the \pgfplotsset{compat=1.16} about? – Hiwi Makro Nov 09 '18 at 14:05 — Hiwi Makro, Nov 09 '18 at 14:05
@HiwiMakro It sets the version to be 1.16. – Nov 09 '18 at 14:06 — , Nov 09 '18 at 14:06

Coordinates of an Intersection, outside of the axis-environment

1 Answers1