Matrix with rows and columns labeled

Question

It is trivial to make matrices like so:

\begin {pmatrix} s & t & a \\ c & k & x \\ cha & n & ge \end {pmatrix}

It is not so trivial to impose labels on the rows and columns as done in page 410 here. I would like to do this. For example, the matrix in 11.6:

enter image description here

Note: I am aware of this thread but this is not what I'm looking for.

You should look at Where is the \matrix command? There you'll see what you're looking for, including using kbordermatrix. — Werner, Jan 16 '15 at 19:25

score 26 · Accepted Answer · answered Jan 16 '15 at 19:57

Here are three different option using \bordermatrix, kbordermatrix and blkarray:

enter image description here

\documentclass{article}
\usepackage{amsmath,kbordermatrix,blkarray}

\renewcommand{\kbldelim}{(}
\renewcommand{\kbrdelim}{)}

\begin{document}
\[
  \mathbf{P} = 
    \bordermatrix{ & H & Y & D \cr
      H & .8 & .2 & .0 \cr
      Y & .3 & .4 & .3 \cr
      D & .2 & .1 & .7 } \qquad
  \mathbf{P} = 
    \kbordermatrix{ & H & Y & D \\
      H & .8 & .2 & .0 \\
      Y & .3 & .4 & .3 \\
      D & .2 & .1 & .7 } \qquad
  \mathbf{P} = 
    \begin{blockarray}{cccc}
        & H & Y & D \\
      \begin{block}{c(ccc)}
        H & .8 & .2 & .0 \\
        Y & .3 & .4 & .3 \\
        D & .2 & .1 & .7 \\
      \end{block}
    \end{blockarray}
\]

\end{document}

See this for more options with border: https://tex.stackexchange.com/a/26447/157031 — Cyriac Antony, Aug 01 '19 at 11:31

score 0 · Answer 2 · answered Aug 26 '23 at 16:02

The package nicematrix has tools to address that kind of problem.

\documentclass{article}
\usepackage{nicematrix}
\begin{document}
\NiceMatrixOptions
  {
    code-for-first-col = \scriptstyle ,
    code-for-first-row = \scriptstyle 
  }
[
\mathbf{P} = 
\begin{pNiceMatrix}[first-col,first-row]
  & H  & Y  & D \
H & .8 & .2 & .0 \
Y & .3 & .4 & .3 \
D & .2 & .1 & .7 \
\end{pNiceMatrix}
]
\end{document}

Matrix with rows and columns labeled

2 Answers2

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