[Tex/LaTex] Tikzpicture – how to make major ticks longer or thicker

pgfplotstickstikz-pgf

I am trying to make the major ticks (11,12,13,14,15,16,17,18,19 and 20) either thicker or longer so that the box plot statistics are easier to see. Does Anyone know how to achieve this?

\documentclass{article}
\usepackage[margin=0.5in]{geometry}
\usepackage{pgfplots}
\usepackage{mathtools}
\usepackage{amsmath}
\usepackage{tikz}
\usepackage{amssymb}
\usetikzlibrary{patterns}
\usepackage{xcolor}
\usetikzlibrary{arrows}
\usepgfplotslibrary{fillbetween}
\usepgfplotslibrary{statistics}
\usetikzlibrary{shapes.misc}
\begin{document}
\begin{tikzpicture}
\pgfmathsetlengthmacro\MajorTickLength{
    \pgfkeysvalueof{/pgfplots/major tick length} * 4
}
\begin{axis}
[
ytick=\empty,
xmin=11,
xmax=20,
xmajorticks=true,
minor x tick num=4,
xtick={11,12,13,14,15,16,17,18,19,20},
axis x line=bottom,
axis line style={latex-latex},
axis y line=none,
enlargelimits=0.05,
height=3.5cm,
width=13cm,
clip=false
]

\addplot[
yshift=0.1cm,
boxplot prepared={
median=15.5,
upper quartile=17.6,
lower whisker=11,
lower quartile=13.6,
upper whisker=19,
whisker extend=0 % height of whiskers
},black
] coordinates {};
%
\end{axis}
\end{tikzpicture}
\end{document}

Thank you!

current output

Best Answer

On page 342 from the manual (version 1.16), it introduces every minor tick/.append style={...} and every major tick/.append style={...} options for customization. You need to use minor tick length = something and major tick length= something inside. I have condensed your code into a minimal example.

PS You don't need \pgfmathsetlengthmacro\MajorTickLength{...}.

Output

\documentclass{article}
\usepackage[margin=0.5in]{geometry}
\usepackage{pgfplots}
\usepackage{tikz}
\pgfplotsset{compat = newest} % Current version is 1.16

\usepgfplotslibrary{statistics}
\begin{document}
\begin{tikzpicture}
\begin{axis}
[
ytick=\empty,
xmin=11,
xmax=20,
minor x tick num=4,
xtick={11,12,13,14,15,16,17,18,19,20},
%%%%%%%%%%%%%%%%%%%% What you need:
every major tick/.append style={very thick, major tick length=10pt, black},
every minor tick/.append style={thick, minor tick length=3pt, red},
%%%%%%%%%%%%%%%%%%%%
axis x line=bottom,
axis line style={latex-latex},
axis y line=none,
enlargelimits=0.05,
height=3.5cm,
width=13cm,
clip=false,
]
\addplot[
yshift=0.2cm,
boxplot prepared={
median=15.5,
upper quartile=17.6,
lower whisker=11,
lower quartile=13.6,
upper whisker=19,
whisker extend=0 % height of whiskers
},black
] coordinates {};
%
\end{axis}
\end{tikzpicture}
\end{document}
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