pgfplots example/boilerplate

pgfplot boilerplate

\documentclass[draft]{article}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\usepackage{pgfplotstable}

\begin{document}


%% Linear plot

\begin{tikzpicture}
    \begin{axis}[
            title=\texttt{pgfplots} example,
            xlabel=shooting parameter $\alpha$,
            ylabel=$\lambda_i$ axis,
            enlarge x limits=false,
            legend entries={$f_1$, $f_2$, $f_3$},
            % positioning is relative to the unit frame
            %legend style={at={(0.1,0.1)}, anchor=south west}
        ]

        %% Read data from file
        \pgfplotstableread{spectrum.txt}\spectrum
        \addplot[color=green, line width=1pt] table[x=x, y=l2, header=true] \spectrum;

        %% Plot expressions from table data
        \addplot[color=red] table[x=x, y expr=exp(-(\thisrow{l2})^2), header=true] \spectrum;

        %% Plot function directly
        \addplot[color=blue, mark=o, domain=0:6] { 1 - (x/3)^2 };

        %% Plot coordinates
        \addplot coordinates { (0, 1) (0.5, 0.5) (1, 0.5) (2, 0) (4, -1) (6, 0) };

        %% Tags
        \node[coordinate, pin=45:{$\lambda_2$}] at (axis cs:5.25,-1) {};

        %% Axis lines
        \draw[ultra thin, color=lightgray] (axis cs:\pgfkeysvalueof{/pgfplots/xmin},0) -- (axis cs:\pgfkeysvalueof{/pgfplots/xmax},0);
        %\draw[ultra thin, color=lightgray] (axis cs:0,\pgfkeysvalueof{/pgfplots/ymin}) -- (axis cs:0,\pgfkeysvalueof{/pgfplots/ymax});
    \end{axis}
\end{tikzpicture}



%% Linear-Log plot

\begin{tikzpicture}
    \begin{semilogyaxis}[xlabel=$x$ axis, ylabel=$f(x)$ axis]
        \addplot[color=green] table[x index=0, y index=3]{131021-154107.db.txt};
        \addplot[color=blue, mark=o, domain=0:6] { 1 - (x/3)^2 };
        \addplot[color=blue, mark=false, domain=0:6] { 1 - (x/4)^2 };
    \end{semilogyaxis}
\end{tikzpicture}


%% Subplots


\begin{figure}
    \centering
        \begin{tikzpicture}
            \matrix {
                \begin{axis}[width=4cm]
                    \addplot[mark=false] {sin(deg(x))};
                \end{axis}
                &
                \begin{axis}[width=4cm]
                    \addplot[mark=false] {cos(deg(x))};
                \end{axis}
                \\
                \begin{axis}[width=4cm]
                    \addplot[mark=false] {x};
                \end{axis}
                &
                \begin{axis}[width=4cm]
                    \addplot[mark=false] {x^2};
                \end{axis}
                \\
            };
        \end{tikzpicture}
\end{figure}

\end{document}