如何在指定 x 刻度和 y 刻度时保留网格线？

Question

我绘制了以下图表：

\begin{figure}[htpb]
    \centering
    \begin{tikzpicture}
        \begin{axis}[
                domain=-3:5,
                smooth,
                axis x line=middle,
                axis y line=middle,
                xlabel=\(x\),
                ylabel=\(y\),
                grid=both,
                xtick={-1, 1},
                ytick={2, 3},
                ymin=-5,
                ymax=4,
            ]
            \addplot[black, thick] {-x^2 + 2 * x + 2};
            \addplot[red, thick, dashed] coordinates{(1,10) (1,-25)};
        \end{axis}
    \end{tikzpicture}
\end{figure}

结果是：

如何保留主/次网格线，同时仍指定我想要的刻度？

Answer 1

一种方法是删除默认刻度xticklabels={}并添加您自己的extra x ticks={-1,0.5,1}（对于 y 轴）。通常，额外的刻度会自带网格线。要禁用此功能，您可以使用extra tick style={grid=none}。

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}

\begin{document}

\begin{tikzpicture}
\begin{axis}[
        domain=-3:5,
        smooth,
        axis x line=middle,
        axis y line=middle,
        xlabel=\(x\),
        ylabel=\(y\),
        grid=both,
        minor tick num=1,
        minor grid style={blue!10!white},
        extra tick style={grid=none},
        xticklabels={},
        extra x ticks={-1,0.5,1},
        yticklabels={},
        extra y ticks={2, 3},
        ymin=-5,
        ymax=4,
    ]
    \addplot[black, thick] {-x^2 + 2 * x + 2};
    \addplot[red, thick, dashed] coordinates{(1,10) (1,-25)};
\end{axis}
\end{tikzpicture}

\end{document}