수직 그래프(x=n)
\begin{tikzpicture} [+preamble] \usepackage{pgfplots} \pgfplotsset{compat=newest} [/preamble] \begin{axis}[ ticks=none, xmin=-1, xmax=5, ymin=-1, ymax=5, axis lines=middle, xlabel=$w$, ylabel=$r$, disabledatascaling] \draw[line width=0.5mm]…