```latex \documentclass[10pt]{article} \usepackage{tikz,pgfplots} \pgfplotsset{compat=1.15} \usepackage{mathrsfs} \usetikzlibrary{arrows} \pagestyle{empty} \begin{document} \definecolor{ffvvqq}{rgb}{1.,0.3333333333333333,0.} \definecolor{qqwuqq}{rgb}{0.,0.39215686274509803,0.} \begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm] \begin{axis}[ x=1.0cm,y=1.0cm, axis lines=middle, ymajorgrids=true, xmajorgrids=true, xmin=-2.0, xmax=8.0, ymin=-4.0, ymax=6.0, xtick={-2.0,0.0,...,8.0}, ytick={-4.0,-2.0,...,6.0}] \clip(-2.,-4.) rectangle (8.,6.); \draw[line width=2.pt,color=qqwuqq,smooth,samples=100,domain=6.38378239159465E-3:8.0] plot(\x,{ln((\x))}); \draw[line width=2.pt,color=ffvvqq,smooth,samples=100,domain=-2.0:8.0] plot(\x,{(\x)-1.0}); \begin{scriptsize} \draw[color=qqwuqq] (0.361514353152552,-6.945244847245772) node {$f$}; \draw[color=ffvvqq] (-5.919656220323494,-6.945244847245772) node {$g$}; \end{scriptsize} \end{axis} \end{tikzpicture} \end{document} ```  如果你把 `\begin{axis}[]...\end{axis}` 注释掉就可以看到明显的错误提示: ```latex ! Package PGF Math Error: I cannot calculate the logarithm of `0.0' (in '{ln((0 .0))}'). ``` 也就是 ln(x) 的起始自变量过小, 把数值调大一些就好了. **如果在回答中得到了想要的回答, 请点击 `采纳回答` 来把问题归档到 `已解决`**