我有以下内容：
\begin{tikzpicture}
\def\xmax{110}
\def\ymax{1}
\def\q{10} % Normalization
\def\ha{101}
\def\hb{210}
\def\hc{340}
\def\hd{553}
\def\he{701}
\def\hf{998}
\def\hg{1023}
\def\aa{200/654}
\def\ab{200/780}
\def\ac{200/1278}
\def\ad{200/888}
\def\ae{200/1782}
\def\af{200/300}
\def\ag{200/1212}
\begin{scope}[yshift=-2.7cm, domain=0:\xmax, >=latex, yscale=4, xscale=0.11, samples=150]
\draw[very thin,color=gray,xstep=10.0cm,ystep=0.3cm] (0,0) grid (\xmax,1.2);
\draw[thick, ->] (0,0) -- (\xmax.1,0) node[right] {$x$};
\draw[thick, ->] (0,0) -- (0,1.2) node[above] {$f(x)$};
\draw[thick, color=red, domain=0:\hg/\q] plot (\x,{
(\x>\ha/\q)*(\aa) +
and(\x>\hb/\q,\x<=\hc/\q)*(\ab) +
and(\x>\hc/\q,\x<=\hd/\q)*(\ac) +
and(\x>\hd/\q,\x<=\he/\q)*(\ad) +
and(\x>\he/\q,\x<=\hf/\q)*(\ae) +
and(\x>\hf/\q,\x<=\hg/\q)*(\af) +
(\x<=\ha/\q)*(\ag)}) node[right] {$f(x)$};
\draw[dashed] (\ha/\q,0) node[below] {$h_1$} -- (\ha/\q,\aa) node[left] {$A_1$};
\draw[dashed] (\hb/\q,0) node[below] {$h_2$} -- (\hb/\q,\ab) node[left] {$A_2$};
\draw[dashed] (\hc/\q,0) node[below] {$h_3$} -- (\hc/\q,\ac) node[left] {$A_3$};
\draw[dashed] (\hd/\q,0) node[below] {$h_4$} -- (\hd/\q,\ad) node[left] {$A_4$};
\draw[dashed] (\he/\q,0) node[below] {$h_5$} -- (\he/\q,\ae) node[left] {$A_5$};
\draw[dashed] (\hf/\q,0) node[below] {$h_6$} -- (\hf/\q,\af) node[left] {$A_{6,1}$};
\draw[dashed] (\hg/\q,0) node[below] {$h_\text{M}$} -- (\hg/\q,\ag) node[left] {$A_{6,2}$};
\end{scope}
\end{tikzpicture}
它显示了一个分段函数。在每个断点处，我想显示一条到达函数值的垂直线，因此是最后一行。然而，我得到的是：
x 位移正确，但 y 位移不正确（只有 y 位移才A1正确）。我可以看到函数有错误值，因为我们有这个值，A1 < A2 < A3但这种情况并没有发生。这是怎么回事？
答案1
我认为pgfplots它比普通的更适合绘图TikZ。
输出
代码
\documentclass[12pt,tikz,border=0pt]{standalone}
\usepackage{pgfplots}
\usepackage{filecontents}
\pgfplotsset{compat=1.14}
\begin{filecontents*}{table.dat}
X Y label
0 654
101 780 $A_1$
210 1278 $A_2$
340 888 $A_3$
553 1782 $A_4$
701 300 $A_5$
998 1212 $A_{6,1}$
1023 1212 {}
\end{filecontents*}
\begin{document}
\begin{tikzpicture}
\begin{axis}
[
clip=false,
height=10cm,
axis lines=center,
xmajorgrids=false, xminorgrids=true,
ymajorgrids=false, yminorgrids=true,
xlabel={$x$}, x label style={anchor=west}, xticklabels={},
ylabel={$f(x)$}, y label style={anchor=south}, yticklabels={},
xtick=data,
hide obscured x ticks=false,
xticklabels={0,$h_1$,$h_2$,$h_3$,$h_4$,$h_5$,$h_6$},
minor xtick={0,10,...,100},
minor ytick={0,.1,...,1},
ymin=0,
enlarge x limits={value=.1,upper},
enlarge y limits={value=.1,upper},
]
\addplot
[
ycomb,
dashed,
thick,
gray,
nodes near coords,
nodes near coords style=
{
anchor=south west,
black,
%fill=white,
},
point meta=explicit symbolic,
]
table [x expr=\thisrow{X}/10, y expr=200/\thisrow{Y}, meta=label] {table.dat};
\addplot[const plot, red, very thick]
table [x expr=\thisrow{X}/10, y expr=200/\thisrow{Y}] {table.dat}
node [pos=.8] {$y=f(x)$};
\end{axis}
\end{tikzpicture}
\end{document}