example-10.7.tex

\documentclass{article}

%% Denote paragraphs with vertical space rather than indenting (not critical)
\usepackage{parskip}

%% Support for URL in introductory text (not needed for main example)
\usepackage{url}

%% *** Enable PGFPLOTS (automatically enables TikZ) ***
\usepackage{pgfplots}

%% Prevent some PGFPLOTS messages (not critical)
\pgfplotsset{compat=1.18,compat/show suggested version=false}


\begin{document}

%% Introductory Text
Example 10.7 from the book\\
\emph{Unlocking LaTeX Graphics: A Concise Guide to Ti$k$Z/PGF and PGFPLOTS}.\\
For more information, visit \url{https://latex-graphics.com}.
\par\bigskip

%% *** START OF EXAMPLE CODE ***
\begin{tikzpicture}[
    arw/.style={<-,shorten <=2mm,shorten >=4mm,thick},
    lbl/.style={draw,fill=white,fill opacity=0.8}
  ]
  \begin{axis}[scale only axis,width=6cm,height=2cm,xmin=1.5]
    \addplot[mark=*] table{data.dat};
    \draw[red,arw] (axis cs:2,5) -- ++(axis direction cs:0,-1.5)
       node[lbl] {$(2,5)$};
    \draw[blue,arw] (axis cs:3,3.3) -- (rel axis cs:0.5,1)
       node[lbl] (A) {$(3,3.3)$};
    \coordinate (B) at (axis cs:4,2.2);
  \end{axis}
  \draw[orange,arw] (B) -- (B|-A) node[lbl] {$(4,2.2)$};
\end{tikzpicture}
%% *** END OF EXAMPLE CODE ***

\end{document}