[Tex/LaTex] Problem in adjusting the mark size in pgfplot

pgfplotstikz-pgf

I am trying to adjust the marker size in the following tikspicture. Unfortunately, when I configure the plot by adding mark size=0.85, the compiler complains with the following message.

Illegal unit of measure (pt inserted) ...ark=*, mark size=0.85, draw=black, smooth]

Adding pt unit to mark size=0.85 does not help. Also, specifying the marker color does not have any effect although I forced the color to be black (it will print out in blue). The following is a MWE when I take out the mark size option from the code.

\documentclass[crop=true,border=2mm]{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{polar}
\usepgfplotslibrary{dateplot} 
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsfonts}
\usepackage{graphicx}

\pgfplotsset{compat=1.7}

\newlength\figureheight
\newlength\figurewidth
\setlength\figureheight{4cm}
\setlength\figurewidth{4cm}

\begin{document}

\begin{tikzpicture} %[scale=1.0]
    \begin{polaraxis}[%
        axis on top,
        width = \figurewidth,
        height = \figureheight,
        scale only axis,
        ymin=5.e5, ymax=1.5e6,
        xtick      ={0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330},
        xticklabels={0, $\frac{\pi}6$, $\frac{\pi}3$, $\frac{\pi}2$, $\frac{2\pi}3$, $\frac{5\pi}6$, $\pi$ , $\frac{7\pi}6$, $\frac{4\pi}3$, $\frac{3\pi}2$, $\frac{5\pi}3$, $\frac{11\pi}6$},
        ytick = {5e5, 1.e6, 1.5e6},
    ]
    \addplot table [%
        col sep=comma, trim cells=true, %
        x=x, y=y, %
        data cs=polarrad, mark=*, draw=black, smooth]
        {mydata.dat};
    \end{polaraxis}
\end{tikzpicture}
\begin{tikzpicture} %[scale=1.0]
    \begin{axis}[%
        axis on top,
        width = \figurewidth,
        height = \figureheight,
        scale only axis,
        xmin=0, xmax=6.2832,
        ymin=5.e5, ymax=1.5e6,
        xlabel = {$\theta$},
        ylabel = {$\Gamma_{\theta}$},
        grid=major,
        xtick      ={0, 0.7854, 1.5708, 2.3562, 3.1416, 3.9270, 4.7124, 5.4978, 6.2832},
        xticklabels={0, $\frac{\pi}4$, $\frac{\pi}2$, $\frac{3\pi}4$, $\pi$ , $\frac{5\pi}4$, $\frac{3\pi}2$, $\frac{7\pi}4$, $2\pi$},
        ]
        \addplot table [%
            col sep=comma, trim cells=true, %
            x=x, y=y, %
            mark=*, draw=black, smooth]%
            {mydata.dat};
    \end{axis}
\end{tikzpicture}

\end{document}

The content of mydata.dat is as follows.

# mydata
x,y
0.0000,1.1686E+06
0.0175,1.1686E+06
0.0349,1.1446E+06
0.0524,1.1165E+06
0.0698,1.1034E+06
0.0873,1.1038E+06
0.1047,1.1059E+06
0.1222,1.1317E+06
0.1396,1.1500E+06
0.1571,1.1372E+06
0.1745,1.1173E+06
0.1920,1.1218E+06
0.2094,1.1257E+06
0.2269,1.1203E+06
0.2443,1.1078E+06
0.2618,1.1043E+06
0.2793,1.1239E+06
0.2967,1.1228E+06
0.3142,1.0912E+06
0.3316,1.0909E+06

Could someone help me adjust the size and color of the marker?

Best Answer

Mark options and plot related options should be supplied to the \addplot command to have effect on the current plot

\documentclass[crop=true,border=2mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.9}
\usepgfplotslibrary{polar}
\usepgfplotslibrary{dateplot} 
\usepackage{amsmath,amssymb,amsfonts}


\newlength\figureheight
\newlength\figurewidth
\setlength\figureheight{4cm}
\setlength\figurewidth{4cm}


\pgfplotstableread[col sep=comma, trim cells=true]{
%# mydata
x,y
0.0000,1.1686E+06
0.0175,1.1686E+06
0.0349,1.1446E+06
0.0524,1.1165E+06
0.0698,1.1034E+06
0.0873,1.1038E+06
0.1047,1.1059E+06
0.1222,1.1317E+06
0.1396,1.1500E+06
0.1571,1.1372E+06
0.1745,1.1173E+06
0.1920,1.1218E+06
0.2094,1.1257E+06
0.2269,1.1203E+06
0.2443,1.1078E+06
0.2618,1.1043E+06
0.2793,1.1239E+06
0.2967,1.1228E+06
0.3142,1.0912E+06
0.3316,1.0909E+06
}\mydata

\begin{document}

\begin{tikzpicture} %[scale=1.0]
    \begin{polaraxis}[%
        axis on top,
        width = \figurewidth,
        height = \figureheight,
        scale only axis,
        ymin=5.e5, ymax=1.5e6,
        xtick      ={0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330},
        xticklabels={0, $\frac{\pi}6$, $\frac{\pi}3$, $\frac{\pi}2$, $\frac{2\pi}3$, $\frac{5\pi}6$, 
                    $\pi$ , $\frac{7\pi}6$, $\frac{4\pi}3$, $\frac{3\pi}2$, $\frac{5\pi}3$, $\frac{11\pi}6$},
        ytick = {5e5, 1.e6, 1.5e6},
    ]
    \addplot[mark=*, mark size=0.2,draw=black, smooth] table [x=x, y=y,data cs=polarrad]{\mydata};
    \end{polaraxis}
\end{tikzpicture}
\begin{tikzpicture} %[scale=1.0]
    \begin{axis}[%
        axis on top,
        width = \figurewidth,
        height = \figureheight,
        scale only axis,
        xmin=0, xmax=6.2832,
        ymin=5.e5, ymax=1.5e6,
        xlabel = {$\theta$},
        ylabel = {$\Gamma_{\theta}$},
        grid=major,
        xtick      ={0, 0.7854, 1.5708, 2.3562, 3.1416, 3.9270, 4.7124, 5.4978, 6.2832},
        xticklabels={0, $\frac{\pi}4$, $\frac{\pi}2$, $\frac{3\pi}4$, 
                     $\pi$ , $\frac{5\pi}4$, $\frac{3\pi}2$, $\frac{7\pi}4$, $2\pi$},
        ]
        \addplot [mark=*, mark size=0.2,draw=black, smooth] table [x=x, y=y] {\mydata};
    \end{axis}
\end{tikzpicture}

\end{document}

enter image description here

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