[Tex/LaTex] Color-bar – surf plot

pgfplotstikz-pgf

I have a surf plot as shown below. enter image description here However, the markings on the color-bar are in steps of 0.05. Instead, I want the markings to be in steps of 0.25. How should I go about doing this? Below is the code, which produces the surf plot shown above.

\begin{tikzpicture}[scale=0.15]
\pgfplotsset{compat=newest}
\tikzstyle{every node}=[font=\Huge]
every mark/.append style={rotate=90}.
\begin{axis}[
colorbar,
view={60}{30},
smooth,
mark size = 1.5,
xmin=16, xmax=24,
ymin=1650, ymax=1675,
zmin=0.25, zmax=2.25,
xtick = {16,18,20,22},
ytick = {1650,1655,1660,1665,1670,1675},
ztick = {0.25,0.5,0.75,1,1.25,1.5,1.75,2,2.25},
xlabel= $a$,
ylabel= $b$,
zlabel= Relative error,
xlabel style = {sloped like x axis},
ylabel style = {sloped like y axis},
]
\addplot3[surf,mesh/rows=5,shader=interp] coordinates {
(16,1650,1.6148) (18,1650,1.6283) (20,1650,1.6421) (22,1650,1.6449) (24,1650,1.6579)
(16,1655,1.5114) (18,1655,1.5058) (20,1655,1.4948) (22,1655,1.4738) (24,1655,1.4474)
(16,1660,1.2262) (18,1660,1.2302) (20,1660,1.2280) (22,1660,1.2320) (24,1660,1.2283)
(16,1665,0.3534) (18,1665,0.3103) (20,1665,0.3159) (22,1665,0.3312) (24,1665,0.3621)
(16,1675,2.0557) (18,1675,1.0734) (20,1675,1.0279) (22,1675,0.9771) (24,1675,0.9127)
};
\end{axis}
\end{tikzpicture}

Best Answer

You can use colorbar style={ ytick={0.50, 0.75, ..., 2.00} } to chose the tick labels for the color bars:

enter image description here

Notes:

I am not sure if there is something wrong with my installation, but I had to remove your scale and \tikzstyle settings on my Mac to obtain a decent image. On my PC version, I did not need to do that -- but based on my previous problems I thought that the Mac installation is ok, and the PC installation is corrupt> But the PC installation produced results identical to your, so I don't know.

Code:

\documentclass{article}
\usepackage{pgfplots}

\pgfplotsset{compat=newest}

\begin{document}
\begin{tikzpicture}
%\tikzstyle{every node}=[font=\Huge]
%every mark/.append style={rotate=90}.
\begin{axis}[
colorbar, colorbar style={ ytick={0.50, 0.75, ..., 2.00} },
view={60}{30},
smooth,
mark size = 1.5,
xmin=16, xmax=24,
ymin=1650, ymax=1675,
zmin=0.25, zmax=2.25,
xtick = {16,18,20,22},
ytick = {1650,1655,1660,1665,1670,1675},
ztick = {0.25,0.5,0.75,1,1.25,1.5,1.75,2,2.25},
xlabel= $a$,
ylabel= $b$,
zlabel= Relative error,
xlabel style = {sloped like x axis},
ylabel style = {sloped like y axis},
]
\addplot3[surf,mesh/rows=5,shader=interp] coordinates {
(16,1650,1.6148) (18,1650,1.6283) (20,1650,1.6421) (22,1650,1.6449) (24,1650,1.6579)
(16,1655,1.5114) (18,1655,1.5058) (20,1655,1.4948) (22,1655,1.4738) (24,1655,1.4474)
(16,1660,1.2262) (18,1660,1.2302) (20,1660,1.2280) (22,1660,1.2320) (24,1660,1.2283)
(16,1665,0.3534) (18,1665,0.3103) (20,1665,0.3159) (22,1665,0.3312) (24,1665,0.3621)
(16,1675,2.0557) (18,1675,1.0734) (20,1675,1.0279) (22,1675,0.9771) (24,1675,0.9127)
};
\end{axis}
\end{tikzpicture}
\end{document}

Related Solutions

[Tex/LaTex] pgfplots: Color a 3D surf plot based on y-value

The color is determined by the meta value for each coordinate. By default, in 3D plots this is the z value of the coordinate. You can tell PGFPlots to use the y value instead by setting point meta=y. You can also use more complex expressions, like point meta=sqrt(x^2+y^2).

Here's an example that uses a custom colormap with the values for the parula colormap:

\documentclass{article}
\usepackage{pgfplots}
\begin{document}

\pgfplotsset{
    colormap={parula}{
        rgb=(0.2081,0.1663,0.5292)
        rgb=(0.2116,0.1898,0.5777)
        rgb=(0.2123,0.2138,0.627)
        rgb=(0.2081,0.2386,0.6771)
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        rgb=(0.0329,0.443,0.872)
        rgb=(0.0498,0.4586,0.8641)
        rgb=(0.0629,0.4737,0.8554)
        rgb=(0.0723,0.4887,0.8467)
        rgb=(0.0779,0.504,0.8384)
        rgb=(0.0793,0.52,0.8312)
        rgb=(0.0749,0.5375,0.8263)
        rgb=(0.0641,0.557,0.824)
        rgb=(0.0488,0.5772,0.8228)
        rgb=(0.0343,0.5966,0.8199)
        rgb=(0.0265,0.6137,0.8135)
        rgb=(0.0239,0.6287,0.8038)
        rgb=(0.0231,0.6418,0.7913)
        rgb=(0.0228,0.6535,0.7768)
        rgb=(0.0267,0.6642,0.7607)
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        rgb=(0.1801,0.7177,0.6424)
        rgb=(0.2178,0.725,0.6193)
        rgb=(0.2586,0.7317,0.5954)
        rgb=(0.3022,0.7376,0.5712)
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}

\begin{tikzpicture}
\begin{axis}[domain=0:pi]
\addplot3 [surf, point meta=y] {cos(deg(x)) * sin(deg(y))};
\end{axis}
\end{tikzpicture}
\end{document}

[Tex/LaTex] How to hide empty (value 0) ybars with pgfplots

You can use

 y filter/.expression={y==0 ? nan : y}

in the options of \addplot.

\documentclass{article}

% ---------------------------------- tikz
\usepackage{pgfplots}          % to print charts
\pgfplotsset{compat=1.12}

\begin{document}

\begin{figure}
  \centering
  \begin{tikzpicture}
    \begin{axis} [
      % general
      ybar,
      scale only axis,
      height=0.5\textwidth,
      width=1.2\textwidth,
      ylabel={\# Dots},
      nodes near coords,
      xlabel={Variation},
      xticklabel style={
        rotate=90,
        anchor=east,
      },
      %enlarge x limits={abs value={3}},
      ]
      \addplot+[y filter/.expression={y==0 ? nan : y}] table [
        x=grade,
        y=value,
      ] {
grade   value
-11 0
-10 0
-9  0
-8  0
-7  0
-6  0
-5  3
-4  1
-3  2
-2  15
-1  11
0   179
1   8
2   1
3   0
4   1
5   2
6   0
7   0
8   0
9   0
10  0
11  0
      };
    \end{axis}
  \end{tikzpicture}
\end{figure}
\end{document}