I got a figure with subplots from Matlab using matlab2tikz function but I don't like the fact that all figures have their own y and labels. I'd like to position a label at the middle of the big figure as shown in the image below? I hope my MWE works for you.
% arara: xelatex
% arara: biber
% arara: xelatex
% arara: xelatex: {synctex: on}
\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{
every axis/.append style={
ylabel absolute,
label style={font=\footnotesize,align=center},
yticklabel style = {font=\scriptsize,/pgf/number format/fixed,/pgf/number format/precision=5},
xticklabel style = {font=\scriptsize,/pgf/number format/fixed,/pgf/number format/precision=5},
legend style = {font=\scriptsize},
title style = {font=\scriptsize,yshift=-2ex},
},
every axis plot/.append style={line width=0.5pt,line cap=round},
}
\pgfkeys{/pgf/number format/.cd,1000 sep={}}
%% the following commands are needed for some matlab2tikz features
\usetikzlibrary{plotmarks}
\usetikzlibrary{arrows.meta}
\usepgfplotslibrary{patchplots}
\usepackage{grffile}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{positioning,circuits.ee.IEC}
\tikzset{parent/.style={align=center,text width=5cm,minimum height=1cm,minimum width=4cm,font=\bfseries},
child/.style={draw,align=center,text width=3cm},
grandchild/.style={align=left,text width=2cm}
}
\newlength\figureheight
\newlength\figurewidth
\setlength\figurewidth{.725\linewidth}
\setlength\figureheight{.4\linewidth}
\definecolor{mycolor1}{rgb}{0.00000,0.44700,0.74100}%
\begin{document}
\begin{figure}
\centering
% 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}{0.00000,0.44700,0.74100}%
%
\begin{tikzpicture}
\begin{axis}[%
width=1.952in,
height=1.493in,
at={(0.758in,2.554in)},
scale only axis,
xmode=log,
xmin=1,
xmax=10000,
xminorticks=true,
xlabel style={font=\color{white!15!black}},
ymin=0,
ymax=40,
ylabel style={font=\color{white!15!black}},
axis background/.style={fill=white},
]
\addplot [color=mycolor1, dashdotted, mark=asterisk, mark options={solid, mycolor1}, forget plot]
table[row sep=crcr]{%
10 6.02502531495016\\
20 6.03786871814991\\
30 6.05918985377419\\
40 6.08886699413247\\
60 6.17254544862453\\
70 6.22570081489845\\
80 6.28662779885325\\
90.0000000000001 6.35463211182034\\
100 6.4294125699592\\
200 7.46591308115097\\
300 8.78144761951078\\
400 10.136509145617\\
500 11.4222338684283\\
600 12.6036026770424\\
700 13.6825207466473\\
800 14.66195948202\\
900.000000000001 15.5620897919143\\
1000 16.3867155871367\\
3000 25.5515280292327\\
4000 28.0389740607155\\
5000 29.9823612547385\\
6000 31.5379616627357\\
7000 32.8534855740365\\
8000 34.0671811172936\\
9000.00000000001 35.0845580745873\\
10000 36.0116071516141\\
};
\end{axis}
\begin{axis}[%
width=1.952in,
height=1.493in,
at={(3.327in,2.554in)},
scale only axis,
xmode=log,
xmin=1,
xmax=10000,
xminorticks=true,
xlabel style={font=\color{white!15!black}},
ymin=-12,
ymax=-8,
ylabel style={font=\color{white!15!black}},
axis background/.style={fill=white},
]
\addplot [color=mycolor1, dashdotted, mark=asterisk, mark options={solid, mycolor1}, forget plot]
table[row sep=crcr]{%
10 -10.0570025948884\\
20 -10.0570031434668\\
30 -10.0570032516035\\
40 -10.0570074959765\\
60 -10.0569978089629\\
70 -10.05699132459\\
80 -10.0570356801329\\
90.0000000000001 -10.0570378448397\\
100 -10.0570620777555\\
200 -10.0572086017414\\
300 -10.0569966527061\\
400 -10.054844222969\\
500 -10.0556254978021\\
600 -10.0563097062558\\
700 -10.056059216611\\
800 -10.0581061739041\\
900.000000000001 -10.0523735647241\\
1000 -10.052976948968\\
3000 -10.0593091075301\\
4000 -10.0365266583425\\
5000 -10.0137299415955\\
6000 -10.0622173106068\\
7000 -10.0980844470786\\
8000 -9.98687857886295\\
9000.00000000001 -9.99348051550582\\
10000 -9.96814078801037\\
};
\end{axis}
\begin{axis}[%
width=1.952in,
height=1.493in,
at={(0.758in,0.481in)},
scale only axis,
xmode=log,
xmin=1,
xmax=10000,
xminorticks=true,
xlabel style={font=\color{white!15!black}},
ymin=-12,
ymax=-8,
ylabel style={font=\color{white!15!black}},
axis background/.style={fill=white},
]
\addplot [color=mycolor1, dashdotted, mark=asterisk, mark options={solid, mycolor1}, forget plot]
table[row sep=crcr]{%
10 -10.0570025945993\\
20 -10.0570030506854\\
30 -10.0570031144715\\
40 -10.0570074041838\\
60 -10.0569975290144\\
70 -10.0569886415872\\
80 -10.0570323392666\\
90.0000000000001 -10.0570340650878\\
100 -10.0570584321855\\
200 -10.0572005583724\\
300 -10.0570005486271\\
400 -10.0548409756516\\
500 -10.0554633512654\\
600 -10.0563301863098\\
700 -10.0562893716279\\
800 -10.0579856199545\\
900.000000000001 -10.0520240983566\\
1000 -10.0568915872956\\
3000 -10.051564746664\\
4000 -10.0268907864406\\
5000 -10.0126815753164\\
6000 -10.0679558888649\\
7000 -10.0979902405306\\
8000 -9.98497209704108\\
9000.00000000001 -9.98102335041346\\
10000 -9.96657990322325\\
};
\end{axis}
\begin{axis}[%
width=1.952in,
height=1.493in,
at={(3.327in,0.481in)},
scale only axis,
xmode=log,
xmin=1,
xmax=10000,
xminorticks=true,
xlabel style={font=\color{white!15!black}},
ymin=0,
ymax=40,
ylabel style={font=\color{white!15!black}},
axis background/.style={fill=white},
]
\addplot [color=mycolor1, dashdotted, mark=asterisk, mark options={solid, mycolor1}, forget plot]
table[row sep=crcr]{%
10 6.02502532663188\\
20 6.03786874364145\\
30 6.05918988451697\\
40 6.08886704374304\\
60 6.17254551850378\\
70 6.22570167429446\\
80 6.2866287687612\\
90.0000000000001 6.35463320389361\\
100 6.42941379238741\\
200 7.4659154555193\\
300 8.78145134644068\\
400 10.136511685466\\
500 11.4222167144186\\
600 12.6036297490859\\
700 13.6824975364228\\
800 14.6619614864612\\
900.000000000001 15.5621034875103\\
1000 16.3828067673392\\
3000 25.5591255050665\\
4000 28.0497587880991\\
5000 29.9824517969779\\
6000 31.530570397572\\
7000 32.8535234900969\\
8000 34.0672090589387\\
9000.00000000001 35.0845680270891\\
10000 36.0116458449977\\
};
\end{axis}
\end{tikzpicture}%
\end{figure}
\end{document}
