Graphics, Figures & Tables ⇒ pgfplots | Additional Ticks on Abscissa

[thinkpadT]

Hi everyone,

I have plotted a spectrum showing "Wavelength" vs "Diffraction Efficiency" and wanted to draw vertical lines indicating some special wavelengths (as shown in the attached image). Here is my written code followed by the data (used "lambda-au.txt").

Code: Select all

\pgfplotsset{compat=newest}
\begin{document}
\begin{tikzpicture}
	\begin{axis} [
  grid =major,
  %grid style={dashed},
% thick,
xlabel= Wavelength  $\lambda $ \lbrack $ nm $\rbrack ,
%xtick = {3,5,...,31},
xmax=210,
xmin=20,
ylabel=Diffraction Efficiency, % \lbrack a.u.\rbrack,x
%yticklabels= , %supress the ylabe numbering
%ymax=9,
ymin=0,
mark = none,
legend style = {legend pos=north east,font=\tiny} %place the legend box in the right place  at ={(0.85, 0.65)}
  ]

  \pgfplotstableread{lambda-au.txt} 
  \teff      %effs=efficiencies
  \addplot [color = blue, mark=none, ] table[y=one] from \teff;
  \addlegendentry{m = -1};
    \addplot [color = violet, mark=none]  table[y=two] from \teff;
   \addlegendentry{m = -2};
      \addplot [color = red, mark=none]  table[y=three] from \teff;
  \addlegendentry{m = -3};
  \addplot [color = orange, mark=none]  table[y=four] from \teff;
  \addlegendentry{m = -4};
  \addplot [color = green, mark=none]  table[y=five] from \teff;
  \addlegendentry{m = -5};
     \end{axis}
\end{tikzpicture}
\end{document}

eff-800.jpg (46.5 KiB) Viewed 10981 times

Until now I couldn't find a useful method to realize my ideas. Any help from you guys would be appreciated very much.

Thx in advance.
-Fawad

[cgnieder]

It would be easier to answer if you'd provided a complete (i.e. compilable) example. Maybe accessing the axis coordinate system (see section 4.16 Custom Annotations of the pgfplots manual) could be a way?

Code: Select all

\documentclass{article}

\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\begin{document}
\begin{tikzpicture}
 \begin{axis}
  \addplot { x^2 } ;
  \draw (axis cs:-1,-2) --++(axis direction cs:0,20) ;
  \draw[red] (rel axis cs:.25,0) -- (rel axis cs:.25,1) ;
 \end{axis}
\end{tikzpicture}
\end{document}

\end{document}

Regards

[feuersaenger]

Hi Fawad,

the approach of clemens can be used here, but pgfplots has support for this use-case:

pgfplots comes with its "extra x ticks" feature which allows to add special ticks at designated positions. You can configure grid lines for these special ticks and special styles for the associated tick labels.

With this feature, a possible answer could be

Code: Select all

\documentclass[a4paper]{article}

\usepackage{pgfplots}

\pgfplotsset{compat=newest}
\begin{document}
\thispagestyle{empty}
\begin{tikzpicture}
\begin{axis} [
	extra x ticks={75,115},
	extra x tick style={
		grid style={thick,black,},
		xtick align=outside,
		tick style={thick,black,},
		xticklabel style={
			font=\small,
		},
	},
	grid =major,
	%grid style={dashed},
	% thick,
	xlabel= Wavelength  $\lambda $ \lbrack $ nm $\rbrack ,
	%xtick = {3,5,...,31},
	xmax=210,
	xmin=20,
	ylabel=Diffraction Efficiency, % \lbrack a.u.\rbrack,x
	%yticklabels= , %supress the ylabe numbering
	%ymax=9,
	ymin=0,
	mark = none,
	legend style = {legend pos=north east,font=\tiny} %place the legend box in the right place  at ={(0.85, 0.65)}
  ]

  \pgfplotstableread{lambda-au.txt}
  \teff      %effs=efficiencies
  \addplot [color = blue, mark=none, ] table[y=one] from \teff;
  \addlegendentry{m = -1};
	\addplot [color = violet, mark=none]  table[y=two] from \teff;
   \addlegendentry{m = -2};
	  \addplot [color = red, mark=none]  table[y=three] from \teff;
  \addlegendentry{m = -3};
  \addplot [color = orange, mark=none]  table[y=four] from \teff;
  \addlegendentry{m = -4};
  \addplot [color = green, mark=none]  table[y=five] from \teff;
  \addlegendentry{m = -5};
	 \end{axis}
\end{tikzpicture}
\end{document}

P.png (21.75 KiB) Viewed 10970 times

The key tick style applies only to the small tick lines, for which xtick align=outside applies.

Best regards

Christian

[thinkpadT]

Hi cgnieder,
i think i forgot to copy the first few lines of my code; sorry for the inconvinience. And thanks for the suggested solution.


Hi feuersaenger,

thank you very much, this looks very nice. thats what i was searching for. Is it possible to put the labels on the upper x-axis? And additionally, is it possible to write on labels for example 160 H5 at 160 nm?

Thank you in everyone helping
have a good one.
-Fawad

[feuersaenger]

Hi,

yes, you can use xticklabel pos=right to place it at the upper limit and you can use xticklabel=CODE to format the label to your needs.

Here is an example:

Code: Select all

    \documentclass[a4paper]{article}

    \usepackage{pgfplots}

    \pgfplotsset{compat=newest}
    \begin{document}
    \thispagestyle{empty}
    \begin{tikzpicture}
    \begin{axis} [
            extra x ticks={75,115},
            extra x tick style={
                    grid style={thick,black,},
                    xtick align=outside,
                    tick style={thick,black,},
                    xticklabel style={
                            font=\small,
                    },
					% ------ CF
					xticklabel pos=right,
					xticklabel={$\pgfmathprintnumber{\tick}$ H5},
            },
            grid =major,
            %grid style={dashed},
            % thick,
            xlabel= Wavelength  $\lambda $ \lbrack $ nm $\rbrack ,
            %xtick = {3,5,...,31},
            xmax=210,
            xmin=20,
            ylabel=Diffraction Efficiency, % \lbrack a.u.\rbrack,x
            %yticklabels= , %supress the ylabe numbering
            %ymax=9,
            ymin=0,
            mark = none,
            legend style = {legend pos=north east,font=\tiny} %place the legend box in the right place  at ={(0.85, 0.65)}
      ]

      \pgfplotstableread{lambda-au.txt}
      \teff      %effs=efficiencies
      \addplot [color = blue, mark=none, ] table[y=one] from \teff;
      \addlegendentry{m = -1};
            \addplot [color = violet, mark=none]  table[y=two] from \teff;
       \addlegendentry{m = -2};
              \addplot [color = red, mark=none]  table[y=three] from \teff;
      \addlegendentry{m = -3};
      \addplot [color = orange, mark=none]  table[y=four] from \teff;
      \addlegendentry{m = -4};
      \addplot [color = green, mark=none]  table[y=five] from \teff;
      \addlegendentry{m = -5};
             \end{axis}
    \end{tikzpicture}
    \end{document}

P.png (22.15 KiB) Viewed 10930 times

Kind regards

Christian

[thinkpadT]

Hi,

Thanks a lot, that's what i was looking for.

-Fawad