# Pgfplots legend style marker size

I have the following plot:

\begin{tikzpicture}

\begin{axis}[
xlabel={\tiny X},
ylabel={\tiny Y},
xmin=0, xmax=5,
ymin=0, ymax=18,
minor x tick num=4,
minor y tick num=4,
ytick={0, 2, 4, 6, 8, 10, 12, 14, 16, 18},
y tick label style={
/pgf/number format/.cd,
fixed,
fixed zerofill,
precision=2,
/tikz/.cd,
font=\tiny},
x tick label style={font=\tiny},
every x tick/.style={color=black, thin},
every y tick/.style={color=black, thin},
xtick pos=left,
ytick pos=left,
axis on top,
width=5cm,
height=5cm,
legend style={mark options={scale=5.0}, at={(0.97,0.03)}, anchor=south east},
clip mode=individual
]
color=red,
solid,
line width=1.0pt,
mark size=1.8pt,
mark=star,
mark options={solid, line width=0.5pt},
error bars/.cd, y dir=both,y explicit]
plot coordinates {
(0, 1)
(1, 2)
(2, 4)
(3, 8)
(4, 16)
};
\end{axis}
\end{tikzpicture}


And I am trying to change the scale/size of the markers inside the legend. I have been looking around for a while now and could not find a solution. The only solution I found was a thread where someone wanted to reduce the scale of the markers in the legend and the suggested solution was to add

    legend style={mark options={scale=0.5}


I tried to use that to increase the scale, but it still doesn't do anything to my final output. I also did try:

    legend style={mark options={size=5pt}


and

    legend style={mark size=5pt}


without success.

I am running: Package: tikz 2010/10/13 v2.10 (rcs-revision 1.76) Package: pgfplots 2015/01/31 v1.12 Data Visualization (1.12)

Does anyone have a suggestion why it would not work, or any other solution to increase the mark size in the legend?

• Weirdly enough, it works if you use legend style={mark size=5pt} and comment out the mark size=1.8pt line in the \addplot options. See tex.stackexchange.com/questions/89797/… – JamesNZ Oct 12 '15 at 9:30
• Thanks for the suggestion. That does work. Unfortunately, now the mark size in the plot is too small. I am guessing its just the default value now. – J DSP lab Oct 12 '15 at 9:48

You can use legend image post style={scale=0.5},. For details, consult page 209-210 of pgfplots manual.

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}

\begin{axis}[
xlabel={\tiny X},
ylabel={\tiny Y},
xmin=0, xmax=5,
ymin=0, ymax=18,
minor x tick num=4,
minor y tick num=4,
ytick={0, 2, 4, 6, 8, 10, 12, 14, 16, 18},
y tick label style={
/pgf/number format/.cd,
fixed,
fixed zerofill,
precision=2,
/tikz/.cd,
font=\tiny},
x tick label style={font=\tiny},
every x tick/.style={color=black, thin},
every y tick/.style={color=black, thin},
xtick pos=left,
ytick pos=left,
axis on top,
width=5cm,
height=5cm,
legend image post style={scale=0.5},  %%% <--- here
legend style={at={(0.97,0.03)}, anchor=south east},
clip mode=individual
]
color=red,
solid,
line width=1.0pt,
mark=star,
mark options={mark size=4pt,solid, line width=0.5pt}, %% make size 4pt for demo
error bars/.cd, y dir=both,y explicit]
plot coordinates {
(0, 1)
(1, 2)
(2, 4)
(3, 8)
(4, 16)
};

Another option is to use forget plot in the \addplot+ options and the add
\addlegendimage{red,line width=1.0pt,,mark=star,mark options={mark size=2pt,solid, line width=0.5pt}};