I want to plot ONE dataset in a pgfplots and use TWO axis with different units on each axis. For example I have one dataset with temperature and want to print a °C scale on the left and a °F on the right.

quick paint example :-)

Thank you :-)

I didn't find the answer yet with google :-(

PS: This is such a great platform and it helps me so much - thanks for all the other answers on this side :-)

This is my code so far with the left axis:



    xmin=0, xmax=100, %- show range
    ymin=345.95, ymax=346.17, %- show range
    domain=0:100, %- calc range
    ytick={346.16,346.11,...,340}, %- labels on the left side
    y tick label style={
      /pgf/number format/.cd,
        fixed zerofill,
    no markers,
    ylabel={Temperature T[K]},  
\addplot gnuplot { (346.16 - 0.002 * x)} ; 
\addplot gnuplot [style=densely dotted] { 346.16 }
node[below left] at (axis cs:100,346.16) {$73^\circ$C};   


  • You can start from this tex.stackexchange.com/questions/53029/…
    – percusse
    Jul 9 '13 at 19:49
  • thank you "percusse" but I do not understand your hint because I do not want to add two datasets! I only want two axis for one dataset??!!...
    – Thomas
    Jul 9 '13 at 19:54
  • You don't need to have two data sets. The axes should overlap to give the two ordinate look. You can modify one of the axis without drawing anything with no x axis ticks etc. If you add a simple example with the data set people can react much faster.
    – percusse
    Jul 9 '13 at 19:56

Here is a simple example though I've used the Fahrenheit instead of Kelvin.


x celc
0 346.16
20 346.11
40 346.06
60 346.01
80 345.96

    \addplot[draw=none,no marks] table \mytable;
    axis y line*=right,
    ylabel={\si{\degree F}},
    axis x line=none,
    \addplot table \mytable;

enter image description here

  • Thank you "percusse" for this great and simple solution :-)
    – Thomas
    Jul 18 '13 at 18:17
  • @Thomas My pleasure :)
    – percusse
    Jul 18 '13 at 18:27

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