1

I want to plot a data with two x axis (top and bottom) and a y axis. The first x and y axes are set from data. The second x axis limits should be same as the first one. I also need to label some ticks on the second x axis. Pgfplots doesn't allow me to label (see figure).

How can I achieve the results?

enter image description here

\documentclass[12pt,a4paper]{article}%
\usepackage{pgfplots}
\usepackage{filecontents}
\def\w{11}
\def\h{10}

\begin{filecontents*}{mydata.csv}
    0,0,0
    0.5963459,1.402948075,0
    1.1520177,2.71020725,0
    1.6688749,3.9261522,0
    2.148838675,5.055302625,0
    2.593862225,6.1022536,0
    3.0059051,7.0716151,0
    3.386911525,7.967961025,0
    3.854113525,8.763110075,0.30397835
    4.7655312,9.359200525,1.8520657
    5.6033659,9.907176575,3.27515805
    6.73565105,10.2090156,4.570585925
    7.803365275,10.46821083,5.760149325
    8.782843025,10.70411198,6.852623
    9.6808764,10.91879745,7.855273375
    10.50381463,11.11416708,8.7749295
    11.25757995,11.29195553,9.617991625
    11.91476308,11.35993613,10.04455928
    12.51314918,11.4149591,10.41695778
    24.97249018,14.50643975,15.46234698
    24.97679915,14.50785408,15.4627031
    24.98072545,14.5091428,15.46302755
    24.984303,14.51031708,15.46332318
    24.9875628,14.51138705,15.46359253
    24.99053308,14.512362,15.46383795
    24.99323953,14.51325038,15.46406155
    24.99570558,14.51405983,15.46426528
    24.99795258,14.51479738,15.46445093
    25,14.51546943,15.46462005
\end{filecontents*}

\begin{document}

    \begin{tikzpicture}
    \begin{axis}[
    width=\w cm, height=\h cm,
    scale only axis,
    axis x line*=bottom,
    axis y line*=left,
    table/x index={0},thick,
    xlabel=$x$,
    ylabel=$y$, 
    ]   
    \foreach \ind in {1,2}{
        \addplot table[y index={\ind}, col sep=comma, mark=none] {mydata.csv};
    }
    \end{axis} 
    %%%%%%%%%%  
    \begin{axis}[
    width=\w cm, height=\h cm,
    scale only axis,thick,
    axis x line*=top, 
    axis y line*=right,
    xtick={3,7},
    xticklabels={a,b},
    yticklabels=none
    ]
    \end{axis}
    \end{tikzpicture}

\end{document}
3
  • 1
    If you add \addplot[opacity=0,domain=2.5:7.5] {x}; to the second axis, you will get a and b.
    – user121799
    Commented Jul 14, 2018 at 11:10
  • Thanks. How to set the top axis limits to the same as the bottom one automatically depending on the data?
    – mert
    Commented Jul 14, 2018 at 11:23
  • I made an update. If you only want to draw one plot, you do not need to use two axis environments.
    – user121799
    Commented Jul 14, 2018 at 11:50

1 Answer 1

1

UPDATE: If you really only want to add the a and b labels, you do not need all the two-axis trickery.

\documentclass[12pt,a4paper]{article}%
\usepackage{pgfplots}
\usepackage{filecontents}
\def\w{11}
\def\h{10}

\begin{filecontents*}{mydata.csv}
    0,0,0
    0.5963459,1.402948075,0
    1.1520177,2.71020725,0
    1.6688749,3.9261522,0
    2.148838675,5.055302625,0
    2.593862225,6.1022536,0
    3.0059051,7.0716151,0
    3.386911525,7.967961025,0
    3.854113525,8.763110075,0.30397835
    4.7655312,9.359200525,1.8520657
    5.6033659,9.907176575,3.27515805
    6.73565105,10.2090156,4.570585925
    7.803365275,10.46821083,5.760149325
    8.782843025,10.70411198,6.852623
    9.6808764,10.91879745,7.855273375
    10.50381463,11.11416708,8.7749295
    11.25757995,11.29195553,9.617991625
    11.91476308,11.35993613,10.04455928
    12.51314918,11.4149591,10.41695778
    24.97249018,14.50643975,15.46234698
    24.97679915,14.50785408,15.4627031
    24.98072545,14.5091428,15.46302755
    24.984303,14.51031708,15.46332318
    24.9875628,14.51138705,15.46359253
    24.99053308,14.512362,15.46383795
    24.99323953,14.51325038,15.46406155
    24.99570558,14.51405983,15.46426528
    24.99795258,14.51479738,15.46445093
    25,14.51546943,15.46462005
\end{filecontents*}

\begin{document}

    \begin{tikzpicture}
    \begin{axis}[
    width=\w cm, height=\h cm,
    scale only axis,
    table/x index={0},thick,
    xlabel=$x$,
    ylabel=$y$, 
    ]   
    \foreach \ind in {1,2}{
        \addplot table[y index={\ind}, col sep=comma, mark=none] {mydata.csv};
    }
    \coordinate (3) at (axis cs:3,0);
    \coordinate (7) at (axis cs:7,0);
    \end{axis} 
    \draw[thin] (3 |- current axis.north east) node[above] {a} -- ++(0,-4pt);
    \draw[thin] (7 |- current axis.north east) node[above] {b} -- ++(0,-4pt);
    %%%%%%%%%%  
    \end{tikzpicture}
\end{document}

enter image description here

OLD ANSWER:

\documentclass[12pt,a4paper]{article}%
\usepackage{pgfplots}
\usepackage{filecontents}
\def\w{11}
\def\h{10}

\begin{filecontents*}{mydata.csv}
    0,0,0
    0.5963459,1.402948075,0
    1.1520177,2.71020725,0
    1.6688749,3.9261522,0
    2.148838675,5.055302625,0
    2.593862225,6.1022536,0
    3.0059051,7.0716151,0
    3.386911525,7.967961025,0
    3.854113525,8.763110075,0.30397835
    4.7655312,9.359200525,1.8520657
    5.6033659,9.907176575,3.27515805
    6.73565105,10.2090156,4.570585925
    7.803365275,10.46821083,5.760149325
    8.782843025,10.70411198,6.852623
    9.6808764,10.91879745,7.855273375
    10.50381463,11.11416708,8.7749295
    11.25757995,11.29195553,9.617991625
    11.91476308,11.35993613,10.04455928
    12.51314918,11.4149591,10.41695778
    24.97249018,14.50643975,15.46234698
    24.97679915,14.50785408,15.4627031
    24.98072545,14.5091428,15.46302755
    24.984303,14.51031708,15.46332318
    24.9875628,14.51138705,15.46359253
    24.99053308,14.512362,15.46383795
    24.99323953,14.51325038,15.46406155
    24.99570558,14.51405983,15.46426528
    24.99795258,14.51479738,15.46445093
    25,14.51546943,15.46462005
\end{filecontents*}

\begin{document}

    \begin{tikzpicture}
    \begin{axis}[
    width=\w cm, height=\h cm,
    scale only axis,
    axis x line*=bottom,
    axis y line*=left,
    table/x index={0},thick,
    xlabel=$x$,
    ylabel=$y$, 
    ]   
    \foreach \ind in {1,2}{
        \addplot table[y index={\ind}, col sep=comma, mark=none] {mydata.csv};
    }
    \end{axis} 
    %%%%%%%%%%  
    \begin{axis}[
    width=\w cm, height=\h cm,
    scale only axis,thick,
    axis x line*=top, 
    axis y line*=right,
    xtick={3,7},
    xticklabels={a,b},
    yticklabels=none
    ]
    \foreach \ind in {1,2}{
        \addplot[opacity=0] table[y index={\ind}, col sep=comma, mark=none] {mydata.csv};
    }
    \end{axis}
    \end{tikzpicture}
\end{document}

enter image description here

3
  • Can it be define a function that extracts table.min and table.max values? In case the data is "big", this can reduce plotting cost of the data secondly.
    – mert
    Commented Jul 14, 2018 at 11:37
  • Yes, this is enough for me. But there is a post here, which explain a similar concept that I can't adjust it to this problem. This could be a complete solution.
    – mert
    Commented Jul 14, 2018 at 11:55
  • @mert Yes, this is indeed very useful if you need the extrema of some columns (even though I am not convinced that this is the simplest solution, I do not know the details but it seems that there advanced methods.) However, if the data is really big, and if you just want to draw some annotations, the above strategy may be advantageous.
    – user121799
    Commented Jul 14, 2018 at 12:01

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