[Tex/LaTex] pgfplots – divide y-axis in 2 parts

pgfplotstikz-pgf

I have a plot, code here. Now the problem I have is that because of the scale of y-axis it looks as if the plots are actually just 3 lines. Now what I want is that the y-axis is sort of splitted. Into a section ranging from -0.2 to 0.2 and a part ranging from -1.5 to -1.3…

So the y-axis would look like something

 0.2 -|
      |
      |
-0.2 -|
      |
-1.3 -|
      |
      |
-1.5 -|
      ----------------------------

Is this possible?

— Okay I see there is a workaround for this using groupplots. But the plot that I give, I was already going to use this inside a groupplot environment with 2 other plots. So can I also use the suggested method in combinations with other normal plots which are combined in a groupplot.

My current setup, now I need the splitting for the third groupplot 

\begin{tikzpicture}

\pgfplotsset{%
  width=4cm,
  height=4cm,
  scale only axis,
  every x tick label/.append style={font=\scriptsize\color{gray!80!black}},
  xmajorgrids,
  xminorgrids,
  every y tick label/.append style={font=\scriptsize\color{gray!80!black}},
  ymajorgrids,
  yminorgrids
}

\begin{groupplot}[%
  group style={
    group size=3 by 1,
    horizontal sep=50pt,
    vertical sep=40pt
  }
]

\nextgroupplot[
xmin=0,
xmax=800,
xlabel={Time [\si{\second}]},
ymin=-0.000196069528802578,
ymax=0.000140838393117182,
ylabel={State error $\mathbf{x} - \mathbf{x}'$},
]

\addplot [
color=red,
solid,
forget plot
]
table[row sep=crcr]{
};

\addplot [
color=green,
solid,
forget plot
]
table[row sep=crcr]{
};

\addplot [
color=blue,
solid,
forget plot
]
table[row sep=crcr]{
};

\nextgroupplot[
xmin=0,
xmax=800,
xlabel={Time [\si{\second}]},
ymin=-3.50920459213846,
ymax=2.98111910953132,
ylabel={$||\delta(t)||/{\delta_0}$}
]
\addplot [
color=blue,
solid,
forget plot
]
table[row sep=crcr]{
};

\nextgroupplot[
xmin=0.5,
xmax=800,
xlabel={Time [\si{\second}]},
ymin=-1.35665432608546,
ymax=0.168623669468375,
ylabel={Lyapunov exponents},
]
\addplot [
color=blue,
solid,
forget plot
]
};
\addplot [
color=green!50!black,
solid,
forget plot
]
table[row sep=crcr]{
};
\addplot [
color=red,
solid,
forget plot
]
table[row sep=crcr]{
};

\end{groupplot}

\end{tikzpicture}%

Let me also note that I need a common y-label, so this solutions to it should be able to work… Create x and y label which overlaps for multiple plots

Best Answer

Here is a suggestion. I use a second groupplot environment for the third axis, and place it relative to the second axis. For the ylabel I simply used shift to move it down a bit. For the third axis, note that the height is set explicitly for each of the groupplots, so that their combined height is the same as the other axes (4cm).

enter image description here

\documentclass[border=5mm,tikz]{standalone}
\usepackage{pgfplots,siunitx}
\usepgfplotslibrary{groupplots}
\begin{document}
\begin{tikzpicture}

\pgfplotsset{%
  width=4cm,
  height=4cm,
  scale only axis,
  every x tick label/.append style={font=\scriptsize\color{gray!80!black}},
  xmajorgrids,
  xminorgrids,
  every y tick label/.append style={font=\scriptsize\color{gray!80!black}},
  ymajorgrids,
  yminorgrids
}

\begin{groupplot}[%
  group style={
    group name=first,
    group size=2 by 1,
    horizontal sep=50pt,
    vertical sep=40pt
  }
]

\nextgroupplot[
xmin=0,
xmax=800,
xlabel={Time [\si{\second}]},
ymin=-0.000196069528802578,
ymax=0.000140838393117182,
ylabel={State error $\mathbf{x} - \mathbf{x}'$},
]


\nextgroupplot[
xmin=0,
xmax=800,
xlabel={Time [\si{\second}]},
ymin=-3.50920459213846,
ymax=2.98111910953132,
ylabel={$||\delta(t)||/{\delta_0}$}
]

\end{groupplot}

\begin{groupplot}[
  group style={
     group name=second,
     group size=1 by 2,
     vertical sep=0pt,
     x descriptions at=edge bottom},
     xmin=0.5,xmax=800,
     anchor=north west]


\nextgroupplot[at={($(first c2r1.outer north east)+(40pt,0)$)},
               ylabel={Lyapunov exponents},
               ylabel style={shift={(-1cm,0)}},
               ymin=-0.3,ymax=0.2,
               axis x line=top, 
               axis y discontinuity=parallel,
               height=2cm]


\nextgroupplot[ymin=-1.5,ymax=-1.28,xlabel={Time [\si{\second}]},
               axis x line=bottom,
               height=2cm]


\end{groupplot}

\end{tikzpicture}%
\end{document}
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