답변1
따라서 문서 클래스나 로드된 패키지를 알지 못한 채 이 (물론 추악한) 예제를 통해 질문의 첫 번째 부분을 해결할 수 있습니다.
\documentclass{article}
\usepackage{mathtools}
\begin{document}
$\frac{x}{\begin{vmatrix}b_1&c_1\\ b_2&c_2 \end{vmatrix}}=\frac{y}{\begin{vmatrix} c_1&a_1 \\ c_2&a_2 \end{vmatrix}}=\frac{1}{\begin{vmatrix} a_1&b_1\\a_2&b_2 \end{vmatrix}}$
$\displaystyle\frac{x}{\begin{vmatrix}b_1&c_1\\ b_2&c_2 \end{vmatrix}}=\frac{y}{\begin{vmatrix} c_1&a_1 \\ c_2&a_2 \end{vmatrix}}=\frac{1}{\begin{vmatrix} a_1&b_1\\a_2&b_2 \end{vmatrix}}$
\end{document}
둘의 차이는 \displaystyle
마음에 들 수도 있고, 마음에 들지 않을 수도 있습니다.
답변2
표 3.6에서Latex 버전 5.04에 대한 짧지 않은 소개\nearrow
, 두 개의 기호 및 를 찾을 수 있습니다 \searrow
. 행렬식에 더미 열과 더미 행(둘 다 가운데에 있음)을 추가하고 이 두 기호를 가운데 셀에 넣을 수 있습니다. 겹치게 하기 위해 음수 간격을 사용했습니다.이것은 우아한 해결책이 아닙니다., 그러나 amsmath 이외의 추가 패키지는 필요하지 않습니다. 나는 또한 다음을 기반으로 너무 우아하지 않은 또 다른 솔루션을 가지고 있습니다 raisebox
.https://en.wikibooks.org/wiki/LaTeX/Boxes#raisebox
\documentclass[12pt,a5paper]{article}
\usepackage{amsmath}
\begin{document}
a\\
\(
\begin{vmatrix}
b_1 & & c_1\\
& \nearrow \hspace{-1em} \searrow &\\
b_2 & & c_2\\
\end{vmatrix}
\)
\\
%another solution
\(
\begin{vmatrix}
b_1 & & c_1\\
b_2 & & c_2\\
\end{vmatrix}
\)
\hspace{-3.2em} \raisebox{-0.3ex}\text{{$\nearrow$}}
\hspace{-1.7em} \raisebox{-0.3ex}\text{{$\searrow$}}
\end{document}
답변3
사용자 jfbu의 코드를 복사하여 붙여넣었습니다.답변에게행렬 요소 사이에 광선 그리기. 꽤 입이 많지만 큰 그래픽 엔진을 피합니다. 매번 두 개의 편집이 필요했습니다. 와 일하다 pdflatex
.
\documentclass{article}
% from https://tex.stackexchange.com/a/277474/4686 (user jfbu)
% --------------------------------START--------------------------------
% matrices
\usepackage{amsmath}
% I discovered a bad interaction of eso-pic with xetex
% which is fixed for an unknown reason to me by loading
% package geometry
\usepackage{geometry}
% transforms the page into a LaTeX picture
\usepackage{eso-pic}
% enhances original LaTeX picture
% there are other packages
% unfortunately I don't know how to draw dashed lines with pict2e
\usepackage{pict2e}
% for some color
\usepackage{color}
\makeatletter
\newbox\JayBox
\def\JayNodeCount{0}%
\def\zapspaces #1 #2{#1#2\zapspaces }
\newcommand\Node [2]{%
% make the code work also if no amsmath
\ifcsname ifmeasuring@\endcsname
\expandafter\@firstoftwo
\else
\expandafter\@secondoftwo
\fi
{\unless\ifmeasuring@}\iftrue
\xdef\JayNodeCount{\the\numexpr\JayNodeCount+\@ne}%
\ifcsname JAY@nodecoords@\romannumeral\JayNodeCount\endcsname
\global
\expandafter\let
\csname JAY@nodename@\expandafter\zapspaces\detokenize{#1} \@gobble
\expandafter\endcsname
\csname JAY@nodecoords@\romannumeral\JayNodeCount\endcsname
\else\typeout{========> New JAY node: run LaTeX again ! <========}%
\fi
\sbox\JayBox{$\m@th #2$}%
\pdfsavepos
\edef\JAY@temp{%
\global
\def\@backslashchar
JAY@nodecoords@\romannumeral\JayNodeCount
{{\noexpand\the\numexpr\pdflastxpos+\number\wd\JayBox/2}%
{\noexpand\the\numexpr\pdflastypos+\number\ht\JayBox/2}%
{\number\wd\JayBox/2}{\number\ht\JayBox/2}}%
}%
\write\@mainaux\expandafter{\JAY@temp}%
\fi
#2%
}%
\def\JAY@north{north}
\def\JAY@south{south}
\def\JAY@west {west}
\def\JAY@east {east}
\def\JAY@northwest{northwest}
\def\JAY@northeast{northeast}
\def\JAY@southeast{southeast}
\def\JAY@southwest{southwest}
\def\JAY@setupAnode #1#2#3#4%
{%
\def\JAY@Ax {#1}\def\JAY@Ay {#2}\def\JAY@Adx {#3}\def\JAY@Ady {#4}%
\ifx\JAY@Aspec\JAY@north\edef\JAY@Ay {\the\numexpr\JAY@Ay+\JAY@Ady}\fi
\ifx\JAY@Aspec\JAY@south\edef\JAY@Ay {\the\numexpr\JAY@Ay-\JAY@Ady}\fi
\ifx\JAY@Aspec\JAY@west \edef\JAY@Ax {\the\numexpr\JAY@Ax-\JAY@Adx}\fi
\ifx\JAY@Aspec\JAY@east \edef\JAY@Ax {\the\numexpr\JAY@Ax+\JAY@Adx}\fi
\ifx\JAY@Aspec\JAY@northwest
\edef\JAY@Ay {\the\numexpr\JAY@Ay+\JAY@Ady}%
\edef\JAY@Ax {\the\numexpr\JAY@Ax-\JAY@Adx}%
\fi
\ifx\JAY@Aspec\JAY@northeast
\edef\JAY@Ay {\the\numexpr\JAY@Ay+\JAY@Ady}%
\edef\JAY@Ax {\the\numexpr\JAY@Ax+\JAY@Adx}%
\fi
\ifx\JAY@Aspec\JAY@southeast
\edef\JAY@Ay {\the\numexpr\JAY@Ay-\JAY@Ady}%
\edef\JAY@Ax {\the\numexpr\JAY@Ax+\JAY@Adx}%
\fi
\ifx\JAY@Aspec\JAY@southwest
\edef\JAY@Ay {\the\numexpr\JAY@Ay-\JAY@Ady}%
\edef\JAY@Ax {\the\numexpr\JAY@Ax-\JAY@Adx}%
\fi
}%
\def\JAY@setupBnode #1#2#3#4%
{%
\def\JAY@Bx {#1}\def\JAY@By {#2}\def\JAY@Bdx {#3}\def\JAY@Bdy {#4}%
\ifx\JAY@Bspec\JAY@north\edef\JAY@By {\the\numexpr\JAY@By+\JAY@Bdy}\fi
\ifx\JAY@Bspec\JAY@south\edef\JAY@By {\the\numexpr\JAY@By-\JAY@Bdy}\fi
\ifx\JAY@Bspec\JAY@west \edef\JAY@Bx {\the\numexpr\JAY@Bx-\JAY@Bdx}\fi
\ifx\JAY@Bspec\JAY@east \edef\JAY@Bx {\the\numexpr\JAY@Bx+\JAY@Bdx}\fi
\ifx\JAY@Bspec\JAY@northwest
\edef\JAY@By {\the\numexpr\JAY@By+\JAY@Bdy}%
\edef\JAY@Bx {\the\numexpr\JAY@Bx-\JAY@Bdx}%
\fi
\ifx\JAY@Bspec\JAY@northeast
\edef\JAY@By {\the\numexpr\JAY@By+\JAY@Bdy}%
\edef\JAY@Bx {\the\numexpr\JAY@Bx+\JAY@Bdx}%
\fi
\ifx\JAY@Bspec\JAY@southeast
\edef\JAY@By {\the\numexpr\JAY@By-\JAY@Bdy}%
\edef\JAY@Bx {\the\numexpr\JAY@Bx+\JAY@Bdx}%
\fi
\ifx\JAY@Bspec\JAY@southwest
\edef\JAY@By {\the\numexpr\JAY@By-\JAY@Bdy}%
\edef\JAY@Bx {\the\numexpr\JAY@Bx-\JAY@Bdx}%
\fi
}%
\newcommand\NodeLine [2][]{\def\JAY@opt{#1}\JAY@NodeLine #2\JAY@NodeLine}
\def\JAY@NodeLine #1[#2]#3->#4[#5]#6\JAY@NodeLine
{%
\edef\JAY@nodeA {\expandafter\zapspaces\detokenize{#1} \@gobble}%
\edef\JAY@nodeB {\expandafter\zapspaces\detokenize{#4} \@gobble}%
\let\JAY@temp\empty
\ifcsname JAY@nodename@\JAY@nodeA\endcsname
\ifcsname JAY@nodename@\JAY@nodeB\endcsname
\edef\JAY@Aspec {\zapspaces #2 \@gobble}%
\edef\JAY@Bspec {\zapspaces #5 \@gobble}%
\expandafter\expandafter\expandafter
\JAY@setupAnode\csname JAY@nodename@\JAY@nodeA\endcsname
\expandafter\expandafter\expandafter
\JAY@setupBnode\csname JAY@nodename@\JAY@nodeB\endcsname
\edef\JAY@temp {%
\noexpand\AddToShipoutPictureFG*{%
% THIS IS THE ONLY PLACE WHERE THE PICTURE SYNTAX IS USED
% here we use \Line from package pict2e
% The optional argument to \NodeLine contains optional commands
{\setlength{\unitlength}{1sp}%
\linethickness{1pt}%
\unexpanded\expandafter{\JAY@opt}%
\noexpand\Line (\JAY@Ax,\JAY@Ay)(\JAY@Bx,\JAY@By)%
}}}%
\fi\fi
\JAY@temp
}
\makeatother
% --------------------------------FINISH-------------------------------
\begin{document}
\Huge
\[\frac{x}
{\begin{vmatrix}\Node{B1}{b_1}&\Node{C1}{c_1}\\
\Node{B2}{b_2}&\Node{C2}{c_2}\end{vmatrix}}
=
\frac{y}
{\begin{vmatrix}
\Node{C1y}{c_1}&\Node{A1y}{a_1} \\
\Node{C2y}{c_2}&\Node{A2y}{a_2} \end{vmatrix}}
=
\frac{1}
{\begin{vmatrix}
a_1&b_1\\a_2&b_2 \end{vmatrix}}
\]
% No need to be inside the display, but
% make sure to issue these commands on the same page !
% TWO COMPILATIONS NEEDED AFTER ANY MODIFICATION
\NodeLine[\color{blue}]{B1[south east] -> C2[north west]}
\NodeLine[\color{red}] {C1[south west]-> B2[north east]}
% for some reason B2[east] gives more pleasing result than B2[north east]
% note that B2 alone does not work, must be B2[]
\NodeLine[\color{green}]{C1y[] -> A2y[]}
\NodeLine[\color{magenta}] {A1y[]-> C2y[]}
\end{document}