[Tex/LaTex] How to scale a matlab graphic and include it in LaTeX using matlab2tikz

MATLABmatlab2tikzpgfplots

I have created a Matlab graphic. Now I want to use matlab2tikz in order to include the graphic in a LaTeX document. Therefore, I scale my graphic in Matlab, using:

%LaTeX set up
 height=10; width=10; 
set( gcf, 'Units', 'centimeters' ) 
set( gcf, 'Position', [ 0 0 width height ] ) 
set( gcf, 'PaperUnits', 'centimeters' ) 
set( gcf, 'PaperSize', [ width height ] ) 
set( gcf, 'PaperPositionMode', 'Manual' ) 
set( gcf, 'PaperPosition', [ 0 0 width height ] )
 box off

I then use cleanfigure() and matlab2tikz(). I save the file in my LaTeX folder and I include it in LaTeX using \input{}.

Two problems occur:

Due to scaling the graphic, the blue line goes a little below the x-axis.
The legend entry of the blue line is missing, although in matlab, it has been there!

This question is closely related to this question. In the answer from gernot, you can see the .tikz file and what the graphic looks like.

Thanks for help!

In this figure, you can see how the blue line goes below the x-axis:

this is the corresponding .tikz file:

\definecolor{mycolor1}{rgb}{1.00000,0.00000,1.00000}%
%
\begin{tikzpicture}

\begin{axis}[%
width=3.038in,
height=3.15in,
at={(0.526in,0.492in)},
scale only axis,
xmin=-30,
xmax=5,
xlabel style={font=\color{white!15!black}},
xlabel={$\text{P}_{\text{in}}\text{ [dBm]}$},
every outer y axis line/.append style={mycolor1},
every y tick label/.append style={font=\color{mycolor1}},
every y tick/.append style={mycolor1},
ymin=36,
ymax=52,
ylabel style={font=\color{mycolor1}},
ylabel={$\text{P}_{\text{out}}\text{ [dBm]}$},
axis background/.style={fill=white},
axis x line*=bottom,
axis y line*=left,
xmajorgrids,
xminorgrids,
ymajorgrids,
yminorgrids,
legend style={at={(0.03,0.97)}, anchor=north west, legend cell align=left, align=left, draw=white!15!black}
]
\addplot [color=mycolor1]
  table[row sep=crcr]{%
-25.21  36.83\\
-20.22  41.62\\
-18.21  43.51\\
-17.21  44.44\\
-16.21  45.36\\
-15.25  46.21\\
-14.26  47.05\\
-13.27  47.86\\
-12.26  48.62\\
-11.76  48.98\\
-11.26  49.33\\
-10.27  49.94\\
-9.77   50.22\\
-9.27   50.47\\
-8.77   50.71\\
-7.76   51.1\\
-7.27   51.25\\
-6.76   51.38\\
-6.26   51.47\\
-5.76   51.53\\
-5.26   51.55\\
-4.76   51.53\\
-4.27   51.46\\
-3.77   51.36\\
-3.28   51.2\\
-2.77   51\\
-2.28   50.75\\
-1.78   50.46\\
-1.27   50.1\\
-0.780000000000001  49.71\\
-0.280000000000001  49.27\\
0.219999999999999   48.79\\
0.719999999999999   48.25\\
};
\addlegendentry{AM/AM}
\addlegendimage{blue}
\addlegendentry{AM/PM}
\end{axis}

\begin{axis}[%
width=3.052in,
height=3.209in,
at={(0.512in,0.433in)},
scale only axis,
every outer x axis line/.append style={black},
every x tick label/.append style={font=\color{black}},
every x tick/.append style={black},
xmin=-30,
xmax=5,
xtick={-30,-25,-20,-15,-10,-5,0,5},
xticklabels={\empty},
every outer y axis line/.append style={blue},
every y tick label/.append style={font=\color{blue}},
every y tick/.append style={blue},
ymin=0,
ymax=40,
ylabel style={font=\color{blue}},
ylabel={$\text{Phi}_{\text{out}}\text{ [deg]}$},
axis x line*=top,
axis y line*=right
]
\addplot [color=blue, forget plot]
  table[row sep=crcr]{%
-25.21  0\\
-24.23  0.119999999999997\\
-23.24  0.170000000000002\\
-22.23  0.25\\
-21.22  0.310000000000002\\
-20.22  0.439999999999998\\
-19.2   0.619999999999997\\
-18.21  0.93\\
-17.21  1.35\\
-16.21  1.97\\
-15.25  2.69\\
-14.26  3.7\\
-13.27  4.97\\
-12.26  6.5\\
-11.76  7.37\\
-10.76  9.26\\
-9.27   12.34\\
-8.77   13.42\\
-8.26   14.59\\
-6.76   18.15\\
-6.26   19.51\\
-4.76   24.05\\
-4.27   25.62\\
-3.28   28.66\\
-2.28   31.5\\
-1.78   32.81\\
-0.780000000000001  35.35\\
-0.280000000000001  36.64\\
0.219999999999999   37.86\\
0.719999999999999   39.02\\
};



\end{axis}
\end{tikzpicture}%

Best Answer

For point 1, the size and position of the two axes are different (look at the first three options of each axis environment), so naturally they're not aligned properly. If you set the same values for both cases, e.g.

width=3.038in,
height=3.15in,
at={(0.526in,0.492in)},

it comes out as desired.

To partially answer point 2, you can get a legend for both plots by adding the following to the end of the first axis environment, i.e. after the \addlegendentry that's already there.

\addlegendimage{blue}
\addlegendentry{Whatevs}

In this case blue is the style of the second plot. If there were other options in that \addplot that related to the style of the line, you'd need to add those as well in the \addlegendimage command.

\documentclass[border=2mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.14}
\usepackage{amsmath}
% This file was created by matlab2tikz.
%
%The latest updates can be retrieved from
%  http://www.mathworks.com/matlabcentral/fileexchange/22022-matlab2tikz-matlab2tikz
%where you can also make suggestions and rate matlab2tikz.
%
\definecolor{mycolor1}{rgb}{1.00000,0.00000,1.00000}%
%
\begin{document}
\begin{tikzpicture}

\begin{axis}[%
width=3.038in,
height=3.15in,
at={(0.526in,0.492in)},
scale only axis,
xmin=-30,
xmax=5,
xlabel style={font=\color{white!15!black}},
xlabel={$\text{P}_{\text{in}}\text{ [dBm]}$},
every outer y axis line/.append style={mycolor1},
every y tick label/.append style={font=\color{mycolor1}},
every y tick/.append style={mycolor1},
ymin=36,
ymax=52,
ylabel style={font=\color{mycolor1}},
ylabel={$\text{P}_{\text{out}}\text{ [dBm]}$},
axis background/.style={fill=white},
axis x line*=bottom,
axis y line*=left,
xmajorgrids,
xminorgrids,
ymajorgrids,
yminorgrids,
legend style={at={(0.03,0.97)}, anchor=north west, legend cell align=left, align=left, draw=white!15!black}
]
\addplot [color=mycolor1]
  table[row sep=crcr]{%
-25.21  36.83\\
-20.22  41.62\\
-18.21  43.51\\
-17.21  44.44\\
-16.21  45.36\\
-15.25  46.21\\
-14.26  47.05\\
-13.27  47.86\\
-12.26  48.62\\
-11.76  48.98\\
-11.26  49.33\\
-10.27  49.94\\
-9.77   50.22\\
-9.27   50.47\\
-8.77   50.71\\
-7.76   51.1\\
-7.27   51.25\\
-6.76   51.38\\
-6.26   51.47\\
-5.76   51.53\\
-5.26   51.55\\
-4.76   51.53\\
-4.27   51.46\\
-3.77   51.36\\
-3.28   51.2\\
-2.77   51\\
-2.28   50.75\\
-1.78   50.46\\
-1.27   50.1\\
-0.780000000000001  49.71\\
-0.280000000000001  49.27\\
0.219999999999999   48.79\\
0.719999999999999   48.25\\
};
\addlegendentry{AM/AM}
\addlegendimage{blue}
\addlegendentry{Whatevs}
\end{axis}

\begin{axis}[%
width=3.038in,
height=3.15in,
at={(0.526in,0.492in)},
scale only axis,
every outer x axis line/.append style={black},
every x tick label/.append style={font=\color{black}},
every x tick/.append style={black},
xmin=-30,
xmax=5,
xtick={-30,-25,-20,-15,-10,-5,0,5},
xticklabels={\empty},
every outer y axis line/.append style={blue},
every y tick label/.append style={font=\color{blue}},
every y tick/.append style={blue},
ymin=0,
ymax=40,
ylabel style={font=\color{blue}},
ylabel={$\text{Phi}_{\text{out}}\text{ [deg]}$},
axis x line*=top,
axis y line*=right
]
\addplot [color=blue, forget plot]
  table[row sep=crcr]{%
-25.21  0\\
-24.23  0.119999999999997\\
-23.24  0.170000000000002\\
-22.23  0.25\\
-21.22  0.310000000000002\\
-20.22  0.439999999999998\\
-19.2   0.619999999999997\\
-18.21  0.93\\
-17.21  1.35\\
-16.21  1.97\\
-15.25  2.69\\
-14.26  3.7\\
-13.27  4.97\\
-12.26  6.5\\
-11.76  7.37\\
-10.76  9.26\\
-9.27   12.34\\
-8.77   13.42\\
-8.26   14.59\\
-6.76   18.15\\
-6.26   19.51\\
-5.26   22.54\\
-4.76   24.05\\
-4.27   25.62\\
-3.28   28.66\\
-2.77   30.13\\
-2.28   31.5\\
-1.78   32.81\\
-1.27   34.09\\
-0.280000000000001  36.64\\
0.219999999999999   37.86\\
0.719999999999999   39.02\\
};
\end{axis}
\end{tikzpicture}%
\end{document}

Related Solutions

[Tex/LaTex] pgfplots scale legend position when below xlabel

Basically, what you are looking for is the key legend pos=outer south, which doesn't exist yet, as explained by the PGFPlots developer in the forum discussion you linked to. The reasons are that it's complicated to take into account whether there's an axis title below the axis or not, which has an influence on where to place the legend. However, it turns out that it's not actually that complicated: The following code snippet assigns a node alias to the x axis label, and then uses the code snippet from How can I know if a node is already defined? in the legend pos/outer south code to decide whether the axis title has to be taken into account or not:

\makeatletter
\pgfplotsset{
    every axis x label/.append style={
        alias=current axis xlabel
    },
    legend pos/outer south/.style={
        /pgfplots/legend style={
            at={%
                (%
                \@ifundefined{pgf@sh@ns@current axis xlabel}%
                {xticklabel cs:0.5}%
                {current axis xlabel.south}%
                )%
            },
            anchor=north
        }
    }
}
\makeatother

Full code:

\documentclass{article}

\usepackage{pgfplots}
\usepackage{amsmath}

\makeatletter
\pgfplotsset{
    every axis x label/.append style={
        alias=current axis xlabel
    },
    legend pos/outer south/.style={
        /pgfplots/legend style={
            at={%
                (%
                \@ifundefined{pgf@sh@ns@current axis xlabel}%
                {xticklabel cs:0.5}%
                {current axis xlabel.south}%
                )%
            },
            anchor=north
        }
    }
}
\makeatother

\newlength\figureheight
\newlength\figurewidth

\begin{document}

\setlength\figureheight{2.0in} 
\setlength\figurewidth{2.0in}
\begin{figure}\centering
    \begin{tikzpicture}[trim axis left]
        \begin{axis}[
        width=\figurewidth,
        height=\figureheight,
        xlabel={x label text},
        ylabel={y label text},clip=false,
        legend pos=outer south
        ]

        \addplot coordinates {(0,0) (1,1)};
        \addlegendentry{Legend Entry 1}

        \addplot coordinates {(0,1) (1,2)};
        \addlegendentry{Legend Entry 2}
        \end{axis}
    \end{tikzpicture}
    \caption{2" tall figure, x label covered} %
\end{figure}
%now with a larger figure, the xlabel will no longer be hidden
\setlength\figureheight{3.0in} 
\setlength\figurewidth{3.0in}
\begin{figure}\centering
    \begin{tikzpicture}[trim axis left]
        \begin{axis}[
        width=\figurewidth,
        height=\figureheight,
        xlabel={x label text},
        ylabel={y label text},
        legend pos=outer south
        ]

        \addplot coordinates {(0,0) (1,1)};
        \addlegendentry{Legend Entry 1}

        \addplot coordinates {(0,1) (1,2)};
        \addlegendentry{Legend Entry 2}

        \end{axis}
    \end{tikzpicture}
    \caption{3" tall figure, x label visible} %
\end{figure}

\end{document}

Alternatively you could place the legend relative to the xlabel node by first naming the node using xlabel style={name=xlabel} and then using legend style={ at={(xlabel.south)}, % Place legend relative to xlabel node yshift=-1ex, anchor=north }

That way, the legend will always be the same distance from the x axis label:

\documentclass{article}

\usepackage{pgfplots}
\usepackage{amsmath}

\newlength\figureheight
\newlength\figurewidth
\pgfplotsset{compat=newest}

\begin{document}

\setlength\figureheight{2.0in} 
\setlength\figurewidth{2.0in}
\begin{figure}
    \begin{tikzpicture}
        \begin{axis}[
        width=\figurewidth,
        height=\figureheight,
        xlabel={x label text},
        xlabel style={name=xlabel}, % Name the xlabel node
        ylabel={y label text},
        legend style={
                at={(xlabel.south)}, % Place legend relative to xlabel node
                yshift=-1ex,
                anchor=north,
                legend cell align=left
            } %
        ]

        \addplot coordinates {(0,0) (1,1)};
        \addlegendentry{Legend Entry 1}

        \addplot coordinates {(0,1) (1,2)};
        \addlegendentry{Legend Entry 2}

        \end{axis}
    \end{tikzpicture}
    \caption{2" tall figure, x label visible} %
\end{figure}
\setlength\figureheight{3.0in} 
\setlength\figurewidth{3.0in}
\begin{figure}
    \begin{tikzpicture}
        \begin{axis}[
        width=\figurewidth,
        height=\figureheight,
        xlabel={x label text},
        xlabel style={name=xlabel},
        ylabel={y label text},
        legend style={at={(xlabel.south)},yshift=-1ex, anchor=north,legend cell align=left} %
        ]

        \addplot coordinates {(0,0) (1,1)};
        \addlegendentry{Legend Entry 1}

        \addplot coordinates {(0,1) (1,2)};
        \addlegendentry{Legend Entry 2}

        \end{axis}
    \end{tikzpicture}
    \caption{3" tall figure, x label visible} %
\end{figure}

\end{document}

[Tex/LaTex] Customizing legend in pgfplots

Regarding your first question:

How can I configure the legend such that it occupies a prescribed amount of space like the width of the figure?

To my knowledge, this is impossible by means of a PGF \matrix -- and these kind of legends are a PGF \matrix. As considered in your question, the remaining option would be to \label every plot and generate a legend manually using \ref to each plot, for example using

enter image description here

\documentclass{standalone}

\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\begin{document}
\begin{tikzpicture}
    \def\INNERSEP{2pt}
    \def\WIDTH{12cm}
    \begin{axis}[
                ybar,
                height=6cm,
                title={Some plot},
                width=\WIDTH,
                scale only axis, % <------------
                axis on top,
                y axis line style={opacity=0},
                axis x line*=bottom,
                tick align=inside,
                tick style={draw=none},
                xtick=data,
                ymajorgrids,
                major grid style={draw=white},
                xtick={1,2,3,4},
                legend image code/.code={%
                    \draw[#1, draw=none] (0cm,-0.1cm) rectangle (0.6cm,0.1cm);
                },  
                extra description/.code={
                    \node[
                        draw,
                        text depth=0pt,
                        at={(0.0,-0.15)},
                        anchor=north west,
                        text width=\WIDTH-2*\INNERSEP,
                        inner sep=\INNERSEP,
                        outer sep=0pt,
                    ] {
                        % Some TeX/LaTeX construct which constructs
                        % the legend:
                        \hbox to \linewidth{%
                            \textbf{Legend:} 
                            \ref{A} Legend a \hfill \ref{B} Legend b \hfill
                        }%
                    };
                },
            ]       
            \addplot coordinates {
                (1, 0.2064)
                (2, 0.3961)
                (3, 0.5961)
                (4, 0.7961)};
                \label{A}
            \addplot coordinates {
                (1, 0.3064)
                (2, 0.4961)
                (3, 0.6961)
                (4, 0.8961)};
                \label{B}
    \end{axis} 
\end{tikzpicture}
\end{document}

Regarding your second question:

How can I recondigure the appearance of the small images for each plot?

As pointed out in some comment, the small images shown in legends can be reconfigured using legend image code. A suitable substitute for the small bars might be to use some rectangles (as in your edit).

enter image description here

\documentclass{standalone}

\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\begin{document}
\begin{tikzpicture}
    \begin{axis}[
                ybar,
                height=6cm,
                title={Some plot},
                width=12cm,
                axis on top,
                y axis line style={opacity=0},
                axis x line*=bottom,
                tick align=inside,
                tick style={draw=none},
                xtick=data,
                ymajorgrids,
                major grid style={draw=white},
                xtick={1,2,3,4},
                legend image code/.code={%
                    \draw[#1, draw=none] (0cm,-0.1cm) rectangle (0.6cm,0.1cm);
                },  
                legend style={
                    draw=none, % ?
                    text depth=0pt,
                    at={(0.0,-0.15)},
                    anchor=north west,
                    legend columns=-1,
                    % default spacing:
                    column sep=1cm,
                    % The text "Legend:"
                    /tikz/column 2/.style={column sep=0pt,font=\bfseries},
                    %
                    % the space between legend image and text:
                    /tikz/every odd column/.append style={column sep=0cm},
                },
            ]       
            \addlegendimage{empty legend}
            \addlegendentry{\textbf{Legend:}}                   
            \addplot coordinates {
                (1, 0.2064)
                (2, 0.3961)
                (3, 0.5961)
                (4, 0.7961)}; \addlegendentry{legend a}
            \addplot coordinates {
                (1, 0.3064)
                (2, 0.4961)
                (3, 0.6961)
                (4, 0.8961)}; \addlegendentry{lengend b}
    \end{axis} 
\end{tikzpicture}
\end{document}

Regarding the third question:

How can I reconfigure the legend such that it starts right next to the text 'Legend:'?

You can distribute the column sep such that it does not apply to your first artificial legend entry if you configure /tikz/column 2/.style. I did that in the example above.

You will note that I also added draw=none due to the lacking support for your first question.

Best Answer

Related Solutions

[Tex/LaTex] pgfplots scale legend position when below xlabel

[Tex/LaTex] Customizing legend in pgfplots

Related Question