En el código que figura a continuación, quería que los corchetes de la \blkarraymatriz coincidieran con los de la matriz original dada en la ecuación (1).
El problema es que, cuando uso \blkarray, los corchetes son demasiado cortos y no se ven tan elegantes como en la matriz original. ¿Se puede arreglar esto? Gracias.
Aquí está el código que fue elegantemente ideado porcfr:
\documentclass[11pt]{book}
\usepackage{amsmath,amsfonts,amssymb,amsthm}
\usepackage{xcolor}
\definecolor{ocre}{RGB}{0,173,239}
\usepackage{blkarray}
\makeatletter
\renewcommand*\env@matrix[1][*\c@MaxMatrixCols c]{%
\hskip -\arraycolsep
\let\@ifnextchar\new@ifnextchar
\array{#1}}
\makeatother
\usepackage{tikz}
\usetikzlibrary{arrows,matrix,positioning,fit,arrows.meta,}
\tikzset{%
highlight/.style={rectangle,rounded corners,fill=ocre!50,draw,
fill opacity=0.5,thick,inner sep=0pt}
}
\newcommand{\tikzmark}[2]{\tikz[overlay,remember picture,
baseline=(#1.base)] \node (#1) {#2};}
%
\newcommand{\Highlight}[1][submatrix]{%
\tikz[overlay,remember picture]{
\node[highlight,fit=(left.north west) (right.south east)] (#1) {};}
}
\newcommand{\mytikzmark}[2]{\tikz[overlay,remember picture, baseline=(#1.base)] \node (#1) {#2};}
\begin{document}
Original Matrix:
\begin{equation}
\begin{bmatrix}[cccc|c]
1 & 0 & -1 & 0 & 0 \\
0 & 1 & 2 & 0 & 0 \\
0 & 0 & 0 & 1 & 0
\end{bmatrix}\\
\end{equation}
Updated Matrix:
\begin{equation}
\begin{blockarray}{ccccc}
x_{1} & x_{2} & x_{3} & x_{4} & \\
\begin{block}{[cccc|c]}
1 & 0 & \mytikzmark{left}{-1} & 0 & 0 \\
0 & 1 & 2 & 0 & 0 \\
0 & 0 & \mytikzmark{right}{0} & 1 & 0 \\
\end{block}
\end{blockarray}
\Highlight[new1]
\end{equation}
\tikz[remember picture,overlay]{%
\draw [LaTeX-] (new1.south) ++(0,-2.5pt) [out=-90,in=160] to ++(5mm,-10mm) node [right, xshift=-2.5mm, font=\itshape, text=red, align=center] {free\\variable};
}
\end{document}
Respuesta1
Podrías usar \bbordermatrixdesde\bordermatrix con corchetes [ ] en lugar de paréntesis ( )
\documentclass{article}
\usepackage{xcolor}
\usepackage{tikz}
\usepackage{etoolbox}
\usetikzlibrary{arrows,matrix,positioning,fit,arrows.meta,}
\definecolor{ocre}{RGB}{0,173,239}
\tikzset{%
highlight/.style={rectangle,rounded corners,fill=ocre!50,draw,
fill opacity=0.5,thick,inner sep=0pt}
}
\newcommand{\tikzmark}[2]{\tikz[overlay,remember picture,
baseline=(#1.base)] \node (#1) {#2};}
%
\newcommand{\Highlight}[1][submatrix]{%
\tikz[overlay,remember picture]{
\node[highlight,fit=(left.north west) (right.south east)] (#1) {};}
}
\newcommand{\mytikzmark}[2]{\tikz[overlay,remember picture, baseline=(#1.base)] \node (#1) {#2};}
\let\bbordermatrix\bordermatrix
\patchcmd{\bbordermatrix}{8.75}{4.75}{}{}
\patchcmd{\bbordermatrix}{\left(}{\left[}{}{}
\patchcmd{\bbordermatrix}{\right)}{\right]}{}{}
\newcommand{\wall}[2]{%
\smash{%
\vrule height \dimexpr\ht\strutbox+#1 depth \dimexpr\dp\strutbox+#2\relax
}%
}
\begin{document}
\begin{equation}
\bbordermatrix{
& x_{1} & x_{2} & x_{3} & x_{4} & & \cr
& 1 & 0 & \mytikzmark{left}{-1} & 0 & \wall{0pt}{3pt} & 0 \cr
& 0 & 1 & 2 & 0 & \wall{3pt}{3pt} & 0 \cr
& 0 & 0 & \mytikzmark{right}{0} & 1 & \wall{3pt}{0pt} & 0 \cr
}
\Highlight[new1]
\end{equation}
\tikz[remember picture,overlay]{%
\draw [LaTeX-] (new1.south) ++(0,-2.5pt) [out=-90,in=160] to ++(5mm,-10mm) node [right, xshift=-2.5mm, font=\itshape, text=red, align=center] {free\\variable};
}
\end{document}
Respuesta2
Esto es bastante parecido a volver a hacer la misma pregunta, pero si desea resaltar una columna en la primera matriz en lugar de la segunda, simplemente coloque las marcas allí.
O egreg quiere que haga esto
\documentclass[11pt]{book}
\documentclass[11pt]{book}
\usepackage{amsmath,amsfonts,amssymb,amsthm}
\usepackage{xcolor}
\definecolor{ocre}{RGB}{0,173,239}
\usepackage{blkarray}
\makeatletter
\renewcommand*\env@matrix[1][*\c@MaxMatrixCols c]{%
\hskip -\arraycolsep
\let\@ifnextchar\new@ifnextchar
\array{#1}}
\makeatother
\usepackage{tikz}
\usetikzlibrary{arrows,matrix,positioning,fit,arrows.meta,}
\tikzset{%
highlight/.style={rectangle,rounded corners,fill=ocre!50,draw,
fill opacity=0.5,thick,inner sep=0pt}
}
\newcommand{\tikzmark}[2]{\tikz[overlay,remember picture,
baseline=(#1.base)] \node (#1) {#2};}
%
\newcommand{\Highlight}[1][submatrix]{%
\tikz[overlay,remember picture]{
\node[highlight,fit=(left.north west) (right.south east)] (#1) {};}
}
\newcommand{\mytikzmark}[2]{\tikz[overlay,remember picture, baseline=(#1.base)] \node (#1) {#2};}
\begin{document}
Original Matrix:
\bigskip
\begin{equation}
\begin{bmatrix}[cccc|c]
\noalign{\vskip-1.5\normalbaselineskip}
x_{1} & x_{2} & x_{3} &\multicolumn{1}{c}{ x_{4}} & \\
\noalign{\vskip.5\normalbaselineskip}
1 & 0 & \mytikzmark{left}{-1} & 0 & 0 \\
0 & 1 & 2 & 0 & 0 \\
0 & 0 & \mytikzmark{right}{0} & 1 & 0
\end{bmatrix}\\
\end{equation}
\Highlight[new1]
\tikz[remember picture,overlay]{%
\draw [LaTeX-] (new1.south) ++(0,-2.5pt) [out=-90,in=160] to ++(5mm,-10mm) node [right, xshift=-2.5mm, font=\itshape, text=red, align=center] {free\\variable};
}
\end{document}
Respuesta3
Con {bNiceArray}of nicematrix, tendrás los mismos corchetes que {array}y {bmatrix}. El entorno {bNiceArray}tiene una clave first-rowpara agregar una fila de etiquetas encima de la matriz.
\documentclass[11pt]{book}
\usepackage{xcolor}
\definecolor{ocre}{RGB}{0,173,239}
\usepackage{nicematrix}
\usepackage{tikz}
\usetikzlibrary{positioning,arrows.meta}
\begin{document}
Original Matrix:
\begin{equation}
\left[\begin{array}{@{}cccc|c@{}}
1 & 0 & -1 & 0 & 0 \\
0 & 1 & 2 & 0 & 0 \\
0 & 0 & 0 & 1 & 0
\end{array}\right]
\end{equation}
Updated Matrix:
\begin{equation}
\begin{bNiceArray}{cccc|c}[first-row]
x_1 & x_2 & x_3 & x_4 \\
1 & 0 & \Block[draw,fill=ocre!50,rounded-corners]{3-1}{}
-1 & 0 & 0 \\
0 & 1 & 2 & 0 & 0 \\
0 & 0 & 0 & 1 & 0 \\
\CodeAfter
\tikz \draw [LaTeX-] (3-3.south) ++(0,-4.5pt) [out=-90,in=160] to ++(5mm,-10mm)
node [right, xshift=-2.5mm, font=\itshape, text=red, align=center] {free\\variable};
\end{bNiceArray}
\end{equation}
\end{document}
