# Label rows of a matrix by characters

How to add label to index the rows and columns of the matrix ? because I want to number the line outside the matrix

     $\begin{array}{lc} \ Mat_{\varPhi to M} & \left(\begin{array}{@{}ccccc@{}} 1 & 1 & 1 & 1 & 1 \\ 0 & 1 & 0 & 0 & 1 \\ 0 & 0 & 1 & 0 & 1 \\ 0 & 0 & 0 & 1 & 1 \\ 0 & 0 & 0 & 0 & 1 \end{array}\right) \\[15pt] \end{array}$

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May I ask you why did you unaccept my answer? Are you experiencing any problems with it? Is it something else you are looking for? –  Gonzalo Medina Jun 13 '12 at 11:31

Here is an option using kbordermatrix:

\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\usepackage{kbordermatrix}% http://www.hss.caltech.edu/~kcb/TeX/kbordermatrix.sty
\begin{document}
$\begin{array}{l@{{}={}}c} \text{Mat}_{\varphi\text{ to }M} & \left(\begin{array}{@{}ccccc@{}} 1 & 1 & 1 & 1 & 1 \\ 0 & 1 & 0 & 0 & 1 \\ 0 & 0 & 1 & 0 & 1 \\ 0 & 0 & 0 & 1 & 1 \\ 0 & 0 & 0 & 0 & 1 \end{array}\right) \end{array}$

\renewcommand{\kbldelim}{(}% Left delimiter
\renewcommand{\kbrdelim}{)}% Right delimiter
$\text{Mat}_{\varphi\text{ to }M} = \kbordermatrix{ & c_1 & c_2 & c_3 & c_4 & c_5 \\ r_1 & 1 & 1 & 1 & 1 & 1 \\ r_2 & 0 & 1 & 0 & 0 & 1 \\ r_3 & 0 & 0 & 1 & 0 & 1 \\ r_4 & 0 & 0 & 0 & 1 & 1 \\ r_5 & 0 & 0 & 0 & 0 & 1 }$

\end{document}


For more options and styles, including the usage of \bordermatrix, see Where is the \matrix command?

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You can use the blkarray package:

\documentclass[12pt]{report}
\usepackage{blkarray}
\usepackage{amsmath}

\begin{document}

$\begin{blockarray}{cccccc} a & b & c & d & e \\ \begin{block}{(ccccc)c} 1 & 1 & 1 & 1 & 1 & f \\ 0 & 1 & 0 & 0 & 1 & g \\ 0 & 0 & 1 & 0 & 1 & h \\ 0 & 0 & 0 & 1 & 1 & i \\ 0 & 0 & 0 & 0 & 1 & j \\ \end{block} \end{blockarray}$

\end{document}


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This approach is way more flexible and intuitive, +1, plus available through CTAN. –  matty T pain Oct 8 '13 at 17:50