防止 pgfplots 上刻度标记标签的排版

Question

$\pm (2/3)\sqrt{3}$我在轴上有刻度标记x。如何防止对这些刻度标记的标签进行排版？

\documentclass{amsart}
\usepackage{amsmath}
\usepackage{amsfonts}

\usepackage{tikz}
\usetikzlibrary{calc,intersections}

\usepackage{pgfplots}
\pgfplotsset{compat=1.11}

\begin{document}


\begin{tikzpicture}
\begin{axis}[width=3.5in, height=3.5in, axis lines=middle, clip=false,
    axis lines=middle, clip=false,
    xmin=-2.5251,xmax=2.4567,
    ymin=-3,ymax=8,
    restrict y to domain=-3:8,
    xtick={-1.1547, 1.1547}, ytick={\empty},
    axis line style={latex-latex},
    xlabel=$x$,ylabel=$y$,
    axis line style={shorten >=-12.5pt, shorten <=-12.5pt},
    xlabel style={at={(ticklabel* cs:1)}, xshift=12.5pt, anchor=north west},
    ylabel style={at={(ticklabel* cs:1)}, yshift=12.5pt, anchor=south west}
]


\addplot[samples=501, domain=-2.5251:2.4567] {x^3 - 4*x + 3};
\addplot[samples=2, latex-latex, dashed, domain=-2.5251:2.4567] {-x + 5};

\fill[blue] (-1, 6) circle [radius=1.5pt];

%P = (2.25, 5.390625) is a point on the graph of y = x^{3} - 4x + 3.
%The slope of the tangent line at P is 11.1875. An equation for the
%tangent line is y = 11.1875x -19.78125. Q = (1.786816, 0) is the
%x-intercept for the line.
\coordinate (P) at (2.25, 5.390625);
\coordinate (Q) at (1.786816, 0);

\end{axis}


%A "pin" is drawn to the cubic polynomial.
\draw[draw=gray, shorten <=1mm, shorten >=1mm] (P) -- ($(P)!0.75cm!90:(Q)$);
\node[anchor=west, inner sep=0, font=\footnotesize] at ($(P)!0.75cm!90:(Q)$){\makebox[0pt][l]{$y = x^{3} - 4x + 3$}};

\end{tikzpicture}

\end{document}

Answer 1

正如我在在问题下方评论添加时xticklabels={}仍然显示给定的刻度，但不显示任何标签。

（除此之外，我对您的代码做了一些修改/改进，以便现在可以更轻松地根据引脚位置更改蓝点、相应的切线和垂直引脚。有关更多详细信息，请查看代码中的注释。）

% used PGFPlots v1.14
\documentclass[border=15pt]{standalone}
\usepackage{pgfplots}
    \usetikzlibrary{calc}
    \pgfplotsset{
        compat=1.11,
        % declare the functions you want to plot
        /pgf/declare function={
            % the function to plot
            f(\x) = (\x)^3 - 4*(\x) + 3;
            % first derivative of the function
            % (giving the slope at a given point `\x')
            g(\x) = 3*(\x)^2 - 4;
            % "point-slope form of a line" going through x=0
            % (I don't know the English translation for the German
            %  "Punktsteigungsform einer Geraden")
            h(\x) = g(\x) * (-\x) + f(\x);
        },
    }
\begin{document}
\begin{tikzpicture}
    \begin{axis}[
        width=3.5in,
        height=3.5in,
        axis lines=middle,
        axis line style={
            latex-latex,
            shorten >=-12.5pt,
            shorten <=-12.5pt,
        },
        xmin=-2.5251,
        xmax=2.4567,
        ymin=-3,
        ymax=8,
        xtick={-1.1547, 1.1547},
        % ---------------------------------------------------------------------
        % this does not show any labels at the ticks
        xticklabels={},
        % ---------------------------------------------------------------------
        ytick={\empty},
        xlabel=$x$,
        ylabel=$y$,
        xlabel style={at={(ticklabel* cs:1)}, xshift=12.5pt, anchor=north west},
        ylabel style={at={(ticklabel* cs:1)}, yshift=12.5pt, anchor=south west},
        % moved common `\addplot' key here
        domain=-2.5251:2.4567,
    ]

        % here you now just call the above defined function
        % (I also reduced the number of `samples' and added the option
        %  `smooth' which gives almost the same result)
        \addplot [samples=51, smooth] {f(x)};
            % define a constant at which x value you want to plot the tangent line
            \pgfmathsetmacro{\X}{-1}
        % now you can easily draw the tangent line with the use of the above
        % defined other functions ...
        \addplot [samples=2, latex-latex, dashed] {g(\X)*x + (h(\X))};

        % ... as well as drawing the circle
        \fill [blue] ({\X}, {f(\X)}) circle [radius=1.5pt];

        % give a value to `\XX' to calculate the point P on `f(x)'
        % then calculate point Q which is the point on x=0 of the tangent line
        % going through point P
            \pgfmathsetmacro{\XX}{2.25}
        \coordinate (P) at (\XX, {f(\XX)});
        \coordinate (Q) at ( 0, {h(\XX)});

    \end{axis}

    % A "pin" is drawn to the cubic polynomial.
    \draw [draw=gray, shorten <=1mm, shorten >=1mm]
        (P) -- ($(P)!0.75cm!90:(Q)$);
    \node [anchor=west, inner sep=0, font=\footnotesize]
        at ($(P)!0.75cm!90:(Q)$){$y = x^{3} - 4x + 3$};

\end{tikzpicture}
\end{document}

Answer 2

您可以使用xticklabel=\relax或xticklabels={}来防止 pgfplots 在 x 轴上为刻度添加标签。