tikzpicture 环境中的整数运算符

Question

我得到了这个数字：

\begin{figure}[H]
    \centering                                             
    \begin{tikzpicture}
        \begin{axis}[width=200pt,axis x line=middle, axis y line=center, ylabel={$\frac{{\delta x}_j}{{\Delta x}_j}$},xlabel={$n$},xmin=0,xmax=6,ymin=0,ymax=1.5]
            \addplot+[mark=none,smooth] (\x,{1/(2^(\x))});
        \end{axis}
    \end{tikzpicture}
    \caption{Effect of the parameter $n$ on the particle nodes scaling}
    \label{n_influence}
\end{figure}

问题是我不想绘制此函数的实数部分，但我想绘制它的整数部分。有人有解决方案吗？

Answer 1

\documentclass{article}
\usepackage{pgfplots}

\begin{document}
\begin{figure}[H]
    \centering                                             
    \begin{tikzpicture}
        \begin{axis}[width=200pt,axis x line=middle, axis y line=center,
                     ylabel={$\frac{{\delta x}_j}{{\Delta x}_j}$},
                     xlabel={$n$},xtick={0,1,2,3,4,5,6},xmin=0,xmax=7,ymin=0,ymax=1.5]
            \addplot+[only marks,domain=0:6,samples=7] (\x,{1/(2^(\x))});
        \end{axis}
    \end{tikzpicture}
    \caption{Effect of the parameter $n$ on the particle nodes scaling}
    \label{n_influence}
\end{figure}

\end{document}