Partitioning a Matrix with lines

Question

I was wondering how to partition a matrix with lines as shown in the picture. IF this a repeat of another question, THEN please do give me the link and I will delete mine.

Thank you!

Does that answer solve your problem? – AboAmmar May 25 '21 at 06:10 — AboAmmar, May 25 '21 at 06:10
Maybe. Would I just add a 3x1 array on the right? – TheGreatJRB May 25 '21 at 06:14 — TheGreatJRB, May 25 '21 at 06:14

score 2 · Accepted Answer · answered May 25 '21 at 06:25

2

This is how you do it in your case.

\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{arydshln}
\begin{document}
[\left(
\begin{array}{c;{2pt/1pt}c}
             & a_1    \
d(f_0)_{x_0} & \vdots \
             & a_1    \ \hdashline[2pt/1pt]
0 \dots 0    & 1
\end{array}
\right)]
\end{document}

answered May 25 '21 at 06:25

AboAmmar

46,352
4
58
127

That way better. I did a nested array lol – TheGreatJRB May 25 '21 at 06:29

F. Pantigny · Answer 2 · 2022-07-15T13:37:11.583

1

With {pNiceArray} of nicematrix (≥ 6.10a of 2022-06-26).

\documentclass[12pt]{article}
\usepackage{nicematrix,tikz}
\NiceMatrixOptions
  {
    custom-line = 
     {
       letter = : ,            % <- for the vertical rules
       command = hdashedline , % <- for the horizontal rules
       tikz = dashed ,
       total-width = \pgflinewidth   % <- optional
     }
  }
\begin{document}
[
\begin{pNiceArray}{ccc:c}
\Block{3-3}{d(f_0)_{x_0}} 
& & & a_1    \
& & & \Vdots \
& & & a_1    \ 
\hdashedline
0 & \Ldots &  0 & 1
\end{pNiceArray}
]
\end{document}

You need several compilations (because of the PGF/Tikz nodes).

edited Jul 15 '22 at 13:37

answered Feb 20 '22 at 11:01

F. Pantigny

40,250

Nice! How do you make the 3 dots spaced apart like the picture? – TheGreatJRB Feb 22 '22 at 21:45
1

Instead of \Ldots (which is a command of nicematrix), you can use the classical \ldots and you will have three dots... – F. Pantigny Feb 22 '22 at 21:55
what about \vdots? they are not spaced like the ones in the textbook – TheGreatJRB Feb 24 '22 at 00:54
1

\Ldots, \Vdots and \Ddots are command of nicematrix which draws continuous dotted line accross multiple cells of the matrix. I've used them as illustration. You can use the classical \ldots, \vdots and \ddots if you want... – F. Pantigny Feb 24 '22 at 09:47

Partitioning a Matrix with lines

2 Answers2