我的部分工作涉及顺序乘积多项式及其分析。在论文或讲座中,使用我们所谓的“命运图”来描述底层概率结构通常很有用,该图通常是从左到右“阅读”(最左边的节点,个人抛硬币,可能是多项式,并根据抛硬币遵循路径。然后个人进入一个状态,获得一枚新硬币,抛硬币,依此类推……)。因此,图表(通常)从单个节点开始,然后快速分支。
到目前为止,我一直在使用专用的图形包在 *TeX 之外生成这些类型的图表,但我想看看是否有办法使用 *TeX 本身生成这些图表。我没有 MWE,但可以提供指向图形的指针,以说明我试图“绘制”的一个非常基本的示例:
挑战在于我经常需要的不对称“分支”(在右侧)。这类似于系统发育树,但我还无法弄清楚如何强迫我找到的任何包/方法给我我想要的东西。
任何建议都值得赞赏——即使是一个简单的代码示例,在 *TeX 中渲染“我的例子”也会很棒。Tikz、PSTricks、pgfplots——其实并不重要(我对任何一个都没有强烈的忠诚度)。
提前致谢...
答案1
您可能会喜欢元帖子对于这种类型的图表。我使用了盒子库来定义文本,然后无边界地绘制它们。
prologues := 3;
outputtemplate := "%j%c.eps";
input boxes;
verbatimtex
\font\sf=phvr8r at 10pt
\def\s#1{\vbox{\halign{\hss{\sf ##}\hss\cr#1\crcr}}}\let\\\cr
etex
beginfig(1);
boxit.A(btex \s{marked and\\released alive\\at start of year} etex);
boxit.S(btex \s{survives\\year} etex);
boxit.K(btex \s{killed by\\hunter} etex);
boxit.N(btex \s{dies from\\`natural' causes} etex);
boxit.r0(btex \s{not retrieved} etex);
boxit.r1(btex \s{retrieved but\\not reported} etex);
boxit.r2(btex \s{retrieved and\\reported} etex);
K.c - A.c = r2.c - K.c = 140 right;
K.c - N.c = S.c - K.c = 60 up;
r2.c - r1.c = r0.c - r2.c = 42 up;
drawunboxed(A, S, K, N, r0, r1, r2);
path p[];
p1 = A.c -- S.c cutbefore bpath A cutafter bpath S;
p2 = A.c -- K.c cutbefore bpath A cutafter bpath K;
p3 = A.c -- N.c cutbefore bpath A cutafter bpath N;
p4 = K.c -- r0.w cutbefore bpath K;
p5 = K.c -- r1.w cutbefore bpath K;
p6 = point .37 of p5 -- r2.w;
for $=1 upto 6: draw p[$]; endfor
label(btex $S$ etex rotated angle direction 0.5 of p1, point .5 of p1 shifted 6 up);
label(btex $K$ etex rotated angle direction 0.5 of p2, point .5 of p2 shifted 6 up);
label(btex $1-S-K$ etex rotated angle direction 0.5 of p3, point .5 of p3 shifted 6 up);
label(btex $1-c$ etex rotated angle direction 0.5 of p4, point .5 of p4 shifted 6 up);
label(btex $c$ etex rotated angle direction 0.5 of p5, point .2 of p5 shifted 6 up);
label(btex $1-\lambda$ etex rotated angle direction 0.5 of p5, point .7 of p5 shifted 6 up);
label(btex $\lambda$ etex rotated angle direction 0.5 of p6, point .5 of p6 shifted 6 up);
endfig;
end.
答案2
forest
始终是一个选项:
\documentclass[12pt, tikz]{standalone}
\usepackage{forest}
\begin{document}
\forestset{
skip me/.style={
shape=coordinate,
inner sep=0pt,
outer sep=0pt,
},
my label/.style n args=2{
edge label={node [midway, sloped, #1, font=\scriptsize, inner sep=1pt] {#2}},
},
}
\begin{forest}
for tree={
grow'=0,
parent anchor=east,
child anchor=west,
anchor=west,
align=center,
if n children=3{
for children={
if n=2{
calign with current edge,
}{},
},
}{},
tier/.wrap pgfmath arg={#1}{level()},
l sep+=10mm
}
[marked and\\released alive\\at start of year
[survives\\year, my label={above}{$S$}
]
[killed by\\hunter, my label={above}{$K$}
[not retrieved, tier=term, my label={above}{$1-c$}
]
[, skip me, my label={below}{$c$}
[retrieved and\\reported, my label={above}{$\lambda$}, tier=term
]
[retrieved but\\not reported, my label={below}{$1-\lambda$}, tier=term
]
]
]
[dies from\\natural causes, my label={below}{$1-S-K$}
]
]
\end{forest}
\end{document}
答案3
你可以适应像这样:
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{trees}
\begin{document}
% Set the overall layout of the tree
\tikzstyle{level 1}=[level distance=3.5cm, sibling distance=3.5cm]
\tikzstyle{level 2}=[level distance=3.5cm, sibling distance=2cm]
% Define styles for bags and leafs
\tikzstyle{bag} = [text width=4em, text centered]
\tikzstyle{end} = [circle, minimum width=3pt,fill, inner sep=0pt]
%\begin{frame}
\begin{tikzpicture}[grow=right, sloped]
\node[bag] {$\bullet$}
child {
node[bag] {$tail$}
child {
node[end, label=right:
$tail$] {}
edge from parent
node[above] {}
node[below] {$\frac12$}
}
child {
node[end, label=right:
$head$] {}
edge from parent
node[above] {$\frac12$}
node[below] {}
}
edge from parent
node[above] {}
node[below] {$\frac12$}
}
child {
node[bag] {$head$}
child {
node[end, label=right:
$tail$] {}
edge from parent
node[above] {}
node[below] {$\frac12$}
}
child {
node[end, label=right:
$head$] {}
edge from parent
node[above] {$\frac12$}
node[below] {}
}
edge from parent
node[above] {$\frac12$}
node[below] {}
};
\end{tikzpicture}
%
\end{document}