我正在尝试制作一个条形图来显示某些程序的运行时间，并且我希望某些条形图超出页面顶部。目前，我通过将条形的值设置为较大的值来实现此目的（请参见下面的示例 - 对于程序 1，测试 3 最右侧的条形图的值为 10，但我希望它超出页面），但我实际上希望条形图缩放到条形图的高度并超出页面顶部。我还希望标签 TO（超时）位于右侧蓝色条的顶部，但目前它位于右侧蓝色和右侧条之间（请参见下面的示例）。有没有办法将 TO 标签放在最右侧的蓝色条上，而不是放在蓝色和红色条的中间？
这是我的代码：
\begin{figure*}
\begin{tikzpicture}
\begin{axis}[
ylabel=Seconds,
ymode=log,
bar width=10pt,
ybar,
x tick label style={rotate=25},
symbolic x coords={Test 1, Test 2, Test 3},
xtick=data,
legend pos = north west,
height=7cm,
width=\textwidth,
]
\addplot
coordinates {
(Test 1, 0.4)
(Test 2, 1.5)
(Test 3, 10)
};
\node[above] at (axis cs:Test 3, 10) {T.O.};
\addplot
coordinates {
(Test 1, 5.5)
(Test 2, 4.6)
(Test 3, 6)
};
\legend{Program 1, Program 2}
\end{axis}
\end{tikzpicture}
\caption{Program Runtimes}
\end{figure*}
以下是我的文件中的条形图：
我想要的条形图如下所示：
这可能吗？
答案1
您可以使用手动设置 y 轴的范围ymax，然后将超时栏设置为该值。这会导致栏延伸到绘图的边缘，而不会扩大绘图区域。
要打印绘图区域外的节点，您可以使用clip=false。要防止刻度标记与标签重叠，您可以使用 关闭顶部刻度标记xtick pos=left。您可以使用 将标签向左移动一点，xshift使其位于条形图上方的中心。
此外，我需要进行设置log origin=infty以确保条形图从图表的底部开始。
梅威瑟：
\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\begin{figure*}
\begin{tikzpicture}
\begin{axis}[
ylabel=Seconds,
ymode=log,
log origin=infty,
bar width=10pt,
ybar,
x tick label style={rotate=25},
symbolic x coords={Test 1, Test 2, Test 3},
xtick=data,
legend pos = north west,
height=7cm,
width=\textwidth,
ymax=15,
clip=false,
xtick pos=left,
]
\addplot
coordinates {
(Test 1, 0.4)
(Test 2, 1.5)
(Test 3, 15)
};
\node[above,xshift=-5pt] at (axis cs:Test 3, 15) {T.O.};
\addplot
coordinates {
(Test 1, 5.5)
(Test 2, 4.6)
(Test 3, 6)
};
\legend{Program 1, Program 2}
\end{axis}
\end{tikzpicture}
\end{figure*}
\end{document}
结果：
我为这个答案使用的参考资料：
答案2
在这里我提出了我的答案的修改解决方案https://tex.stackexchange.com/a/365826/95441使其也适用于对数图。这样做的好处是，所有超出的条形图ymax都会“自动”获得文本。有关详细信息，请查看代码中的注释。
% used PGFPlots v1.18.1
% (modified version of <https://tex.stackexchange.com/a/365826/95441>)
\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
% create a variable to store the `ymax' value
\pgfmathsetmacro{\ymax}{15}
\begin{axis}[
ymode=log,
% (plot all bars from bottom (i.e. from the bottom axis line))
log origin=infty,
ybar,
symbolic x coords={Test 1, Test 2, Test 3},
xtick=data,
% use the previously created variable here
ymax=\ymax,
% (this i just added so the outer most bars aren't clipped partially)
enlarge x limits={0.2},
% -----------------------------------------------------------------
% we only want to print some text ...
nodes near coords={T.O.},
% ... when the y value is greater than `ymax`
% (it is `ln` instead of `log10` because internally logarithmic values
% are calculated on the basis $e$)
y filter/.code={\pgfmathparse{min(ln(y),ln(\ymax))}},
% ---------------------------------------------------------------------
% now we create a style for the `nodes near coords` which is dependent
% on the value
% (adapted from <http://tex.stackexchange.com/a/141006/95441>)
% (#1: the THRESHOLD after which we switch to a special display)
nodes near coords greater equal only/.style={
% define the style of the nodes with "small" values
small value/.style={
/tikz/coordinate,
},
every node near coord/.append style={
check for small values/.code={
\begingroup
% this group is merely to switch to FPU locally.
% Might be unnecessary, but who knows.
\pgfkeys{/pgf/fpu}
\pgfmathparse{\pgfplotspointmeta<(#1)}
\global\let\result=\pgfmathresult
\endgroup
%
% simplifies debugging:
%\show\result
%
\pgfmathfloatcreate{1}{1.0}{0}
\let\ONE=\pgfmathresult
\ifx\result\ONE
% AH: our condition 'y < #1' is met.
\pgfkeysalso{/pgfplots/small value}
\fi
},
check for small values,
},
},
% assign a value to the new style which is the threshold at which
% the `small value' style is used.
% Of course in this case it should be the logarithmic `\ymax' value
nodes near coords greater equal only=ln(\ymax),
% -----------------------------------------------------------------
]
\addplot coordinates {(Test 1, 0.4) (Test 2, 1.5) (Test 3, 16)};
\addplot coordinates {(Test 1, 5.5) (Test 2, 4.6) (Test 3, 6)};
\end{axis}
\end{tikzpicture}
\end{document}
