Observaciones

Question

¿Cómo puedo dibujar el siguiente tipo de matriz sin cambiar la alineación horizontal de las entradas de las columnas?

|   c11 c12 c13   c14   c15 c16   c17 | c18 c19 | |
|   c21 c22 c23   c24 | c25 c26 | c27   c28 c29   |
|   c31 c32 c33   c34 | c35 c36 | c37   c38 c39   |
| | c41 c42 c43 | c44   c45 c46   c47   c48 c49   |

Observación: Hay tres submatrices dentro de la matriz principal:

submatriz 1: c18 a c19
submatriz 2: c25 a c36
submatriz 3: c41 a c43

donde |se muestra como paréntesis de gran tamaño (y ).

Este problema es diferente de matriz en una matriz.

Answer 1

Observaciones

Espero haber entendido bien tu explicación.

Utilizando una biblioteca específica \tikzmarky calligraphyTikZ de Andrew Stacey, puede lograr el siguiente resultado. Deberá volver a ejecutar latexvarias veces para lograr la posición correcta.

Implementación

\documentclass{standalone}
\usepackage{amsmath,tikz}
\usetikzlibrary{decorations,calligraphy}
\newcommand\tikzmark[2]{\tikz[remember picture,baseline=(#1.base)]{\node[inner sep=0pt] (#1) {#2};}}
\begin{document}
$
\begin{pmatrix}
    c11  & c12 & c13  & c14 & c15                   & c16                   & c17 & (c18 & c19) \\
    c12  & c22 & c23  & c24 & \tikzmark{c25}{$c25$} & \tikzmark{c26}{$c26$} & c27 & c28  & c29  \\
    c13  & c32 & c33  & c34 & \tikzmark{c35}{$c35$} & \tikzmark{c36}{$c36$} & c37 & c38  & c39  \\
    (c14 & c42 & c43) & c44 & c45                   & c46                   & c47 & c48  & c49  \\
\end{pmatrix}
$
\begin{tikzpicture}[remember picture,overlay]
    \draw[thick,decorate,decoration={calligraphic straight parenthesis}] (c35.south west) -- (c25.north west);
    \draw[thick,decorate,decoration={calligraphic straight parenthesis}] (c26.north east) -- (c36.south east);
\end{tikzpicture}
\end{document}

Producción

---

Usando la calcbiblioteca, puede compensar el mal espaciado de las llaves TikZ agregando un desplazamiento de .2emcomo en

\begin{tikzpicture}[remember picture,overlay]
    \draw[thick,decorate,decoration={calligraphic straight parenthesis}] ($(c35.south west)+(-.2em,0)$) -- ($(c25.north west)+(-.2em,0)$);
    \draw[thick,decorate,decoration={calligraphic straight parenthesis}] ($(c26.north east)+(.2em,0)$) -- ($(c36.south east)+(.2em,0)$);
\end{tikzpicture}

que produce

---

En nombre del comentario de Christopher Creutzig, aquí hay otra solución (aún usando tikzmark) que no implica escribir paréntesis dentro de la matriz.

\documentclass{standalone}
\usepackage{amsmath,tikz}
\usetikzlibrary{calc,decorations,calligraphy}
\newcommand\tikzmark[2]{\tikz[remember picture,baseline=(#1.base)]{\node[inner sep=0pt] (#1) {#2};}}
\begin{document}
$
\begin{pmatrix}
    c11                   & c12 & c13                   & c14 & c15                   & c16                   & c17 & \tikzmark{c18}{$c18$} & \tikzmark{c19}{$c19$} \\
    c12                   & c22 & c23                   & c24 & \tikzmark{c25}{$c25$} & \tikzmark{c26}{$c26$} & c27 & c28                   & c29                   \\
    c13                   & c32 & c33                   & c34 & \tikzmark{c35}{$c35$} & \tikzmark{c36}{$c36$} & c37 & c38                   & c39                   \\
    \tikzmark{c14}{$c14$} & c42 & \tikzmark{c43}{$c43$} & c44 & c45                   & c46                   & c47 & c48                   & c49                   \\
\end{pmatrix}
$
\begin{tikzpicture}[remember picture,overlay]
    \draw[thick,decorate,decoration={calligraphic straight parenthesis}] ($(c35.south west)+(-.2em,0)$) -- ($(c25.north west)+(-.2em,0)$);
    \draw[thick,decorate,decoration={calligraphic straight parenthesis}] ($(c26.north east)+(.2em,0)$) -- ($(c36.south east)+(.2em,0)$);
    \node[left=.2em] at (c14) {$($};
    \node[left=.2em] at (c18) {$($};
    \node[right=.2em] at (c19) {$)$};
    \node[right=.2em] at (c43) {$)$};
\end{tikzpicture}
\end{document}

Answer 2

El siguiente MWE inserta los corchetes (..) en el tamaño apropiado:

\documentclass{article}
\begin{document}
\[
  \left(\begin{array}{@{\hspace*{1ex}}*{9}{c}@{\hspace*{1ex}}}
    c_{11} & c_{12} & c_{13} & c_{14} & c_{15} & c_{16} & c_{17} & \llap{$\bigl($}c_{18} & c_{19}\rlap{$\bigr)$} \\
    c_{21} & c_{22} & c_{23} & c_{24} & \llap{\raisebox{\dimexpr\ht\strutbox-\height}[0pt][0pt]{$\biggl($}}c_{25} & 
      c_{26}\rlap{\raisebox{\dimexpr\ht\strutbox-\height}[0pt][0pt]{$\biggr)$}} & c_{27} & c_{28} & c_{29} \\
    c_{31} & c_{32} & c_{33} & c_{34} & c_{35} & c_{36} & c_{37} & c_{38} & c_{39} \\
    \llap{$\bigl($}c_{41} & c_{42} & c_{43}\rlap{$\bigr)$} & c_{44} & c_{45} & c_{46} & c_{47} & c_{48} & c_{49}
  \end{array}\right)
\]
\end{document}

La superposición permite mantener el espaciado horizontal, mientras que los corchetes cambian de tamaño utilizando sus \bigequivalentes *.

Answer 3

Con {pNiceMatrix}de nicematrixy su comando incorporado \SubMatrix.

\documentclass{article}
\usepackage{nicematrix}

\begin{document}
$\begin{pNiceMatrix}[margin]
c11 & c12 & c13 & c14 & c15 & c16 & c17 & c18 & c19 \\
c12 & c22 & c23 & c24 & c25 & c26 & c27 & c28 & c29 \\
c13 & c32 & c33 & c34 & c35 & c36 & c37 & c38 & c39 \\
c14 & c42 & c44 & c45 & c46 & c47 & c48 & c48 & c49 
\CodeAfter
  \SubMatrix({1-7}{1-8})
  \SubMatrix({2-5}{3-6})
  \SubMatrix({4-1}{4-3})
\end{pNiceMatrix}$
\end{document}