[Tex/LaTex] PGFplots – label each group plots

pgfplotstikz-pgf

In this group plot how do I add labels to individual graphs. I want to label each graph as (a), (b), (c)…

 \documentclass[margin=5mm]{standalone}
        \usepackage{pgfplots}
        \usetikzlibrary{matrix}
        \usepgfplotslibrary{groupplots}
        \pgfplotsset{compat=newest}
        \begin{document}

        \begin{tikzpicture}
                \begin{groupplot}[group style={group size= 2 by 4},height=5cm,width=6.4cm]
                        \nextgroupplot[title=type1,ylabel={Range1 }]
                                        \addplot[blue] {x};\label{plots:plot1}
                                        \addplot[red] {x^2};\label{plots:plot2}
                                        \addplot[green] {2*x};\label{plots:plot3}
                                        \coordinate (top) at (rel axis cs:0,1);% coordinate at top of the first plot
                        \nextgroupplot[title=type2]
                                        \addplot[blue]{x};
                        \nextgroupplot[ylabel={Range2 }]
                                        \addplot[blue]{x};
                        \nextgroupplot
                                        \addplot[blue]{x};
                        \nextgroupplot[ylabel={Range3 }]
                                        \addplot[blue]{x};
                        \nextgroupplot
                                        \addplot[blue]{x};
                        \nextgroupplot[xlabel={Number of Threads},ylabel={Range4 }]
                                        \addplot[blue]{x};
                        \nextgroupplot[xlabel={Number of Threads}]
                                        \addplot[blue]{x};
                                        \coordinate (bot) at (rel axis cs:1,0);% coordinate at bottom of the last plot
                \end{groupplot}
                \path (top-|current bounding box.west)-- 
                            node[anchor=south,rotate=90] {throughput} 
                            (bot-|current bounding box.west);
        % legend
        \path (top|-current bounding box.north)--
                    coordinate(legendpos)
                    (bot|-current bounding box.north);
        \matrix[
                matrix of nodes,
                anchor=south,
                draw,
                inner sep=0.2em,
                draw
            ]at([yshift=1ex]legendpos)
            {
                \ref{plots:plot1}& curve 1&[5pt]
                \ref{plots:plot2}& curve2&[5pt]
                \ref{plots:plot3}& curve 3\\};
        \end{tikzpicture}
        \end{document}

output:
output

Best Answer

You can use group names key and with the help of positioninglibrary ad a node below every plot like:

\node[below = 0.5cm of my plots c1r1.south] {(a)};

Here c1r1 means column 1 and row 1.

 \documentclass[margin=5mm]{standalone}
        \usepackage{pgfplots}
        \usetikzlibrary{matrix,positioning}
        \usepgfplotslibrary{groupplots}
        \pgfplotsset{compat=newest}
        \begin{document}

        \begin{tikzpicture}
                \begin{groupplot}[group style={group name=my plots,group size= 2 by 4,vertical sep=1.5cm },height=5cm,width=6.4cm]
                        \nextgroupplot[title=type1,ylabel={Range1 }]
                                        \addplot[blue] {x};\label{plots:plot1}
                                        \addplot[red] {x^2};\label{plots:plot2}
                                        \addplot[green] {2*x};\label{plots:plot3}
                                        \coordinate (top) at (rel axis cs:0,1);% coordinate at top of the first plot
                        \nextgroupplot[title=type2]
                                        \addplot[blue]{x};
                        \nextgroupplot[ylabel={Range2 }]
                                        \addplot[blue]{x};
                        \nextgroupplot
                                        \addplot[blue]{x};
                        \nextgroupplot[ylabel={Range3 }]
                                        \addplot[blue]{x};
                        \nextgroupplot
                                        \addplot[blue]{x};
                        \nextgroupplot[xlabel={Number of Threads},ylabel={Range4 }]
                                        \addplot[blue]{x};
                        \nextgroupplot[xlabel={Number of Threads}]
                                        \addplot[blue]{x};
                                        \coordinate (bot) at (rel axis cs:1,0);% coordinate at bottom of the last plot
                \end{groupplot}
                \node[below = 0.5cm of my plots c1r1.south] {(a)};
                \node[below = 0.5cm of my plots c2r1.south] {(b)};
                \node[below = 0.5cm of my plots c1r2.south] {(c)};
                \node[below = 0.5cm of my plots c2r2.south] {(d)};
                \node[below = 0.5cm of my plots c1r3.south] {(e)};
                \node[below = 0.5cm of my plots c2r3.south] {(f)};
                \node[below = 0.9cm of my plots c1r4.south] {(g)};
                \node[below = 0.9cm of my plots c2r4.south] {(h)};
                \path (top-|current bounding box.west)--
                            node[anchor=south,rotate=90] {throughput}
                            (bot-|current bounding box.west);
        % legend
        \path (top|-current bounding box.north)--
                    coordinate(legendpos)
                    (bot|-current bounding box.north);
        \matrix[
                matrix of nodes,
                anchor=south,
                draw,
                inner sep=0.2em,
                draw
            ]at([yshift=1ex]legendpos)
            {
                \ref{plots:plot1}& curve 1&[5pt]
                \ref{plots:plot2}& curve2&[5pt]
                \ref{plots:plot3}& curve 3\\};
        \end{tikzpicture}
        \end{document}

enter image description here

You may have to adjust the vertical sep so as to accommodate these nodes like I did (1.5cm).

Related Solutions

[Tex/LaTex] Label plots in pgfplots without entering coordinates manually

The current version of pgfplots (>= 1.5.1) supports this as you expected it in the first place (i.e. using node[pos=0.75]):

enter image description here

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\thispagestyle{empty}
\begin{tikzpicture}
\begin{axis}
\addplot {x^2} node [pos=0.75,pin={-10:$x^2$},inner sep=0pt] {};
\addplot {1.5*x^2} node [pos=0.75,pin={170:$1.5 x^2$},inner sep=0pt] {};
\end{axis}
\end{tikzpicture}


\begin{tikzpicture}
 \begin{axis}[
        axis y line=center,
        axis x line=middle, 
        axis on top=true,
        xmin=-7,
        xmax=7,
        ymin=-4,
        ymax=4,
        clip=false
] 

\addplot[
    mark=none,
    domain=-4:6,
    samples=80,
    red,
    thick,
] {(x<-2)*-2 + (!(x<-2) && (x<3))*x + (!(x<3)) * 3}
    node[pos=0.1,pin=135:{\color{purple}$f(x)=-2$}] {}
    node[pos=0.6,pin=135:{\color{blue}$f(x)=x$}] {}
    node[pos=0.9,pin=135:{\color{green!70!black}$f(x)=3$}] {}
;
\end{axis}
\end{tikzpicture}

\end{document}

It is available for download on http://pgfplots.sourceforge.net/

[Tex/LaTex] pgfplots: group stacked bars

This happens because of numerical inaccuracies of the mod function when using the fpu library (which is the case for most calculations within an axis environment). Sometimes, the function incorrectly returns the divisor instead of zero (\pgfmathparse{mod(15,5)}, for instance).

You can fix this by defining a new version of the mod function that checks for this error:

\pgfmathdeclarefunction{fpumod}{2}{%
    \pgfmathfloatdivide{#1}{#2}%
    \pgfmathfloatint{\pgfmathresult}%
    \pgfmathfloatmultiply{\pgfmathresult}{#2}%
    \pgfmathfloatsubtract{#1}{\pgfmathresult}%
    \pgfmathfloatifapproxequalrel{\pgfmathresult}{#2}{\def\pgfmathresult{0}}{}%
}

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.9}
\usepackage{pgfplotstable}

\pgfmathdeclarefunction{fpumod}{2}{%
    \pgfmathfloatdivide{#1}{#2}%
    \pgfmathfloatint{\pgfmathresult}%
    \pgfmathfloatmultiply{\pgfmathresult}{#2}%
    \pgfmathfloatsubtract{#1}{\pgfmathresult}%
    \pgfmathfloatifapproxequalrel{\pgfmathresult}{#2}{\def\pgfmathresult{0}}{}%
}

\begin{document}
\pgfplotstableread{%
x y
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
}\loadedtable

        \begin{tikzpicture}
            \begin{axis}[xbar stacked, ytick=data, y=0.9cm]
                \addplot table[x=x,y expr={\thisrow{y} - (fpumod(\thisrow{y},5)/2)}] \loadedtable ;
                \addplot table[x=x,y expr={\thisrow{y} - (fpumod(\thisrow{y},5)/2)}] \loadedtable ;
            \end{axis}
        \end{tikzpicture}
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Label plots in pgfplots without entering coordinates manually

[Tex/LaTex] pgfplots: group stacked bars

Related Question