Coordinates on the x axis of tikz plot are incorrectly displayed

axisgridspgfplotstikz-pgf

I am trying to draw a function as well as a shaded grid on the same axes. Although I use a step size of 1cm in the grid between -3 and 0, the xticks, as well as the shaded region look misplaced. how can I solve this? thanks

\begin{tikzpicture}
\begin{axis}[axis lines=right,  
    axis x line=middle,
    xlabel={$t$},
    ylabel={$x$},
    %position spatial axes label on top of the axis
    every axis y label/.style={
    at={(ticklabel* cs:1.05)},
    anchor=south,
},  xtick={-7, -6, -5,  -4,  -3, -2 ,-1},
%    xticklabels={$-7$, $-6$, $-5$,  $-4$,  $-3$, $-2$ ,$-1$},
%    ytick={0.2,0.4,0.6,0.8,1},
    domain=-7:0,
    xmin=-7, xmax=0,
    ymin=0, ymax=1.1,
    samples=500,
]
    \addplot+[mark=none,color=black] {e^(x/2.75)};
\draw[step=1cm,color=gray!50,opacity=0.5] (-3,0) grid (0,1);
\filldraw [fill=gray, draw=black,opacity=0.5]
-- (-3,0)
-- (-3,0.2)
-- (-2,0.2)
-- (-2,0.4)
-- (-1,0.4)
-- (-1,0.6)
-- (0,0.6)
-- (0,0)
-- cycle;
\end{axis}
\end{tikzpicture}

Best Answer

The coordinates inside an axis environment are not the same as those outside it. The way it works is that pgpflots sets the size of the axis, and then scales things so that the range (defined either by the data or xmin/xmax) fits inside that width.

If you set

scale only axis,
width=7cm, height=5.5cm

things might look better.

scale only axis is required because pgfplots leaves 45pt of space in both x- and y-directions for axis labels. Hence, if you set width=345pt, the width of the axis box alone will be 300pt. width=7cm is because your x-range is from -7 to 0, and you have a tick every 1 axis unit. height=5.5cm is because your y-range is from 0 to 1.1 with ticks every 0.2 axis units.

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\begin{document}
\begin{tikzpicture}
\begin{axis}[axis lines=right,  
    axis x line=middle,
    xlabel={$t$},
    ylabel={$x$},
    %position spatial axes label on top of the axis
    every axis y label/.style={
       at={(ticklabel* cs:1.05)},
       anchor=south,
    },
    xtick={-7, ..., -1},
    ytick={0,0.2,...,1.1},
    domain=-7:0,
    xmin=-7, xmax=0,
    ymin=0, ymax=1.1,
    samples=50,
    scale only axis,
    width=7cm, height=5.5cm
]
\addplot+[mark=none,color=black] {e^(x/2.75)};

\draw[step=1cm,color=gray!50,opacity=0.5] (-3,0) grid (0,1);
\filldraw [fill=gray, draw=black,opacity=0.5]
(-3,0) -| (0,0.6) -| (-1,0.4) -| (-2,0.2) -| cycle;

\end{axis}
\end{tikzpicture}
\end{document}

Related Solutions

[Tex/LaTex] pgfplots: percentage in matrix plot

It does not work in your MWE because you are overwriting it by also giving the option nodes near coors to the \addplot command. Remove the latter one (or specify format here), and it will print. I added a thinspace before the percentage sign, although it can also be recommended to load the siunitx package and let that format and typeset the values for you.

Anyway, here's the quickfixed version:

\documentclass[border=3pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{%
  width=5cm,
  height=18cm,
  compat=1.13,
  colormap={blackwhite}{gray(0cm)=(1); gray(1cm)=(0.5)},
  xticklabels={LPIBG, ALL, HPIBG},
  xtick={0,...,2},
  ytick=\empty
}

\begin{document}
\begin{tikzpicture}
\begin{axis}[%
  enlargelimits=false,
  xlabel style={font=\footnotesize},
  ylabel style={font=\footnotesize},
  legend style={font=\footnotesize},
  xticklabel style={font=\footnotesize},
  yticklabel style={font=\footnotesize},
  colorbar,
  colorbar style={%
    ytick={0,20,40,60,80,100},
    yticklabels={0,20,40,60,80,100},
    yticklabel={\pgfmathprintnumber\tick\,\%},
    yticklabel style={font=\footnotesize}
  },
  point meta min=0,
  point meta max=100,
  nodes near coords={\pgfmathprintnumber\pgfplotspointmeta\,\%},
  every node near coord/.append style={xshift=0pt,yshift=-7pt, black, font=\footnotesize},
]

\addplot[
matrix plot,
mesh/cols=3,
point meta=explicit]
table[meta=C]{
  x y C
  0 0 80
  1 0 36
  2 0 40
  0 1 64
  1 1 80
  2 1 60
  0 2 52
  1 2 84
  2 2 72
  0 3 72
  1 3 28
  2 3 32
  0 4 56
  1 4 84
  2 4 80
  0 5 72
  1 5 52
  2 5 44
  0 6 4
  1 6 84
  2 6 41
  0 7 37
  1 7 69
  2 7 84
  0 8 63
  1 8 53
  2 8 82
  0 9 78
  1 9 74
  2 9 39
  0 10 39
  1 10 63
  2 10 88
  0 11 76
  1 11 74
  2 11 49
  0 12 39
  1 12 6
  2 12 88
  0 13 46
  1 13 33
  2 13 75
  0 14 88
  1 14 67
  2 14 54
  0 15 79
  1 15 83
  2 15 75
  0 16 50
  1 16 46
  2 16 71
  0 17 92
  1 17 71
  2 17 75
  0 18 46
  1 18 33
  2 18 8
};
\end{axis}
\end{tikzpicture}
\end{document}

[Tex/LaTex] Pgfplot: axis label is not displayed

Your problem is that you have

\begin{axis}[...][...]

LaTeX reads only the options in the first pair of brackets, everything in the second pair is ignored it seems. Your xlabel is in the second pair.

Here is a working code. I commented out the x label style, but I also changed the coordinates for it. And I moved the legend, and commented the ylabel and title, as they are empty anyways.

\documentclass{article}
\usepackage{pgfplots}
\usepackage{amsmath}
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}[scale=0.7] %ADE
   \begin{axis}[
      legend style={
         at={(1,1)},
         anchor=north east
      },
      y label style={rotate=-90},
%      x label style={at={(axis description cs:1,0)},anchor=north},
      xlabel = \textbf{number of scenarios},
      xmin = 1, xmax = 16,
      %ylabel = \boldsymbol{}  $\text{ }     \text{ }  \text{ }$,
      ymin = 0.6, ymax = 2,
%      title=\textbf{ },
      xtick={2,...,15}
      ]
      \addplot coordinates {
        (2,2.40891)
        (3,1.9175)
        (4,1.50502)
        (5,1.31557)
        (6,1.17325)
        (7,1.10642)
        (8,1.01808)
        (9,1.00266)
        (10,0.960289)
        (11,0.924278)
        (12,0.893612)
        (13,0.873685)
        (14,0.858911)
        (15,0.83322)
         };
      \addplot coordinates {
        (2,2.04606)
        (3,1.57398)
        (4,1.27563)
        (5,1.13986)
        (6,1.05718)
        (7,0.990486)
        (8,0.936371)
        (9,0.926426)
        (10,0.89885)
        (11,0.868987)
        (12,0.842847)
        (13,0.826911)
        (14,0.818169)
        (15,0.793917)
      };
     \legend{
        Variant D,
        Variant E}
  \end{axis}
\end{tikzpicture}
\end{figure}
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] pgfplots: percentage in matrix plot

[Tex/LaTex] Pgfplot: axis label is not displayed

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