Graphics, Figures & Tables ⇒ Customization of Plot

[grumm]

Hello,

here is an excerpt from my document:

Code: Select all

\documentclass{article}
\usepackage{pgfplots}
\usepgfplotslibrary{dateplot}

\pgfplotsset{
  compat=1.3,
  width=12cm
}

\begin {document}
  \begin{tikzpicture}
    \begin{axis}[
      date coordinates in=x,
      xmin=2011-03-19,
      xmax=2013-06-30,
      xlabel={March 19th  2011 through June 2013},
      xticklabel=\day,
      ylabel={Weight},
    ]
      \addplot coordinates {
        (2011-03-19,191.0)
        (2011-03-20,191.2)
        (2011-03-21,192.4)
        (2011-03-22,193.2)
        (2011-03-23,192.6)
        (2011-03-25,192.4)
        (2011-03-26, 195.4)
        (2011-03-27, 194.6)
        (2011-03-28, 194.2)
        (2011-03-29, 193.8)
        (2011-03-30, 194.2)
        (2011-03-31, 194.6)
      };
    \end{axis}
  \end{tikzpicture}
\end{document}

Is it possible to do any of the following?

1. assign a color to a single point?
2. assign a shape to a single point?
3. specify a particular date with xticklabel=\day, or some other way?

The full data set contains about a thousand values and I would like to be able to highlight individual points in the graph.

Thank you very much for any help,
Gerard McConnell

[Klausiber]

Is it possible to do any of the following?

1. assign a color to a single point?
2. assign a shape to a single point?
3. specify a particular date with xticklabel=\day, or some other way?

Just use individual addplot commands and overwrite the important points. You may also use ordinary TikZ (see pgf) drawing commands with the axis cs coordinate system:

Code: Select all

\documentclass{article}
\usepackage{pgfplots}
\usepgfplotslibrary{dateplot}

\pgfplotsset{
  compat=1.3,
  width=12cm
}

\begin {document}
  \begin{tikzpicture}
    \begin{axis}[
      date coordinates in=x,
      xmin=2011-03-19,
      xmax=2011-03-31,
      xlabel={March 2011},
      xticklabel={\day.\month.},
      ylabel={Weight},
    ]
      \addplot[blue, mark=*] coordinates {
        (2011-03-19,191.0)
        (2011-03-20,191.2)
        (2011-03-21,192.4)
        (2011-03-22,193.2)
        (2011-03-23,192.6)
        (2011-03-25,192.4)
        (2011-03-26,195.4)
        (2011-03-27,194.6)
        (2011-03-28,194.2)
        (2011-03-29,193.8)
        (2011-03-30,194.2)
        (2011-03-31,194.6)
      };

      \addplot[only marks, red, mark=*, mark size=4pt] coordinates {
        (2011-03-23,192.6)
      };

      \node[coordinate, pin=below:{Important!}] at (axis cs:2011-03-23,192.6) {};

    \end{axis}
  \end{tikzpicture}
\end{document}

If you want to highlight a specific date you could use extra x ticks as explained here. For more information refer to the excellent pgfplots documentation.

[grumm]

That is outstanding, thanks very much