[Tex/LaTex] pgfplots multiple plots in one file

pgfplotspgfplotstable

In pgfplots is it possible to have several plots in one datafile?

The goal is to add about 20 plots, which has different number of points and not the same x-value, to the same axis. (app. 350 points)

One posible solution is to have the plots in separate column, and then use loads of 'nan' because of the different x values:

    x  p1   p2  P3  ...
    1  3    nan nan ...
    2  nan  5   nan ...
    6  4    8   nan ...
    8  7    nan nan ...
    ...

I do not like this solution:o(

The gnuplot solution is nice: the different plots are separated in the datafile by two newlines, and they are selected by 'index'. Does something similar exist in pgfplots? or any other solution?

Best Answer

You can use gnuplot in the background by using \addplot gnuplot [raw gnuplot] {<gnuplot commands>};:

\documentclass{article}
\usepackage{pgfplots}
\usepackage{filecontents}

\begin{filecontents*}{data.txt}
1 1
2 4
3 9
4 16
5 25


1 1
2.5 5
6 12
\end{filecontents*}


\begin{document}
\begin{tikzpicture}
\begin{axis}
\addplot gnuplot [raw gnuplot] {plot 'data.txt' index 0};
\addplot gnuplot [raw gnuplot] {plot 'data.txt' index 1};
\end{axis}
\end{tikzpicture}
\end{document}

Related Solutions

[Tex/LaTex] How to maintain the ratio between two axis in pgfplots

You can save the y unit vector length of the first plot into a macro by using

\pgfplotsextra{
    \global\edef\yunit{\pgfplotsunitylength}
}

which can then be used to set the y unit vector in the second plot by setting y=\yunit. This will only work correctly if you use disabledatascaling, though, otherwise the unit vector will not be reported correctly.

\documentclass{article}

\usepackage{pgfplots}
\begin{document}

\pgfplotsset{
    scale only axis, % To make sure the plot *areas* are the same width
    width=5cm,
    enlarge y limits={abs=0.2}, % To make sure the axes are extended by the same absolute amount
    disabledatascaling
}

\begin{tikzpicture}
        \begin{axis}
                \addplot coordinates {
                (0,0)
                (1,2)
                };
        \pgfplotsextra{
            \global\edef\yunit{\pgfplotsunitylength}
        }
        \end{axis}
\end{tikzpicture}
\begin{tikzpicture} 
        \begin{axis}[y=\yunit]
                \addplot coordinates {
                (0,0)
                (1,2)
                };
                \addplot coordinates {
                (0,0)
                (1,3)
                };
        \end{axis}
\end{tikzpicture}
\end{document}

}

[Tex/LaTex] pgfplots and errorbars

There exist options to explicitly set the error-bars.

/pgfplots/error bars/x dir=none|plus|minus|both
/pgfplots/error bars/y dir=none|plus|minus|both
/pgfplots/error bars/z dir=none|plus|minus|both

Try to adding this options to \addplot.

UPD: Replace the file {data.dat} with table[x index=0, y index=1, y error index=2]{data.dat}, that would set x to first column, y for second and y error to third column. No file needed to be changed.

Best Answer

Related Solutions

[Tex/LaTex] How to maintain the ratio between two axis in pgfplots

[Tex/LaTex] pgfplots and errorbars

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