Descriptive text around a matrix

Question

I am trying to write a matrix with a bit of text sidewards and above it in order to explain its meaning. At the moment, this is my code:

\begin{equation}
 \begin{turn}{90}
 \mbox{\# rows}
 \end{turn}
\stackrel{\mbox{\# columns}}{
\begin{pmatrix}
  1 & 1 & 1 & 0 & 0\\
  0 & 0 & 1 & 0 & 1\\
  0 & 0 & 0 & 0 & 0\\
  1 & 1 & 1 & 0 & 1\\
  1 & 1 & 0 & 0 & 1\\
 \end{pmatrix}
 }
\end{equation}

And this is the result:

enter image description here

However, the text on the left side of the matrix is not correctly centered (it is too high). How to center the text around the matrix correctly?

Related: http://tex.stackexchange.com/a/48597/14757 – Sigur Feb 23 '15 at 21:05 — Sigur, Feb 23 '15 at 21:05

score 10 · Accepted Answer · answered Feb 23 '15 at 21:06

10

It's easier with an array and \rotatebox:

\documentclass{article}
\usepackage{amsmath}
\usepackage{graphicx}

\begin{document}
\begin{equation}
\begin{array}{@{}c@{\hspace{1ex}}c@{}}
 & \text{\# columns} \\[1ex]
\rotatebox[origin=c]{90}{\text{\# rows}} &
\begin{pmatrix}
  1 & 1 & 1 & 0 & 0\\
  0 & 0 & 1 & 0 & 1\\
  0 & 0 & 0 & 0 & 0\\
  1 & 1 & 1 & 0 & 1\\
  1 & 1 & 0 & 0 & 1\\
 \end{pmatrix}
\end{array}
\end{equation}
\end{document}

enter image description here

answered Feb 23 '15 at 21:06

egreg

1,121,712

why to use @{}? The c alignment is not enough to centre the array contents? – Sigur Feb 23 '15 at 21:16
1

@Sigur The additional space on the sides may be unwanted depending on the context. – egreg Feb 23 '15 at 21:18

score 2 · Answer 2 · answered Feb 24 '15 at 00:39

Just because I like doing things with stacks...

The inter-column gap can be adjusted by changing the 2ex argument to \setstacktabbedgap. Vertical row separation is adjusted with the argument to \setstackgap{L}{length}.

\documentclass{article}
\usepackage{amsmath, graphicx, tabstackengine}
\stackMath
\begin{document}
\begin{equation}
\setstacktabbedgap{2ex}
\setstackgap{L}{1.2\baselineskip}
\rotatebox[origin=c]{90}{\text{\# rows}}
\stackon{%
\parenMatrixstack{
  1 & 1 & 1 & 0 & 0\\
  0 & 0 & 1 & 0 & 1\\
  0 & 0 & 0 & 0 & 0\\
  1 & 1 & 1 & 0 & 1\\
  1 & 1 & 0 & 0 & 1
}
}{\text{\# columns}}
\end{equation}
\end{document}

enter image description here

score 2 · Answer 3 · answered Oct 08 '20 at 11:05

Here is what you can do with nicematrix.

\documentclass{article}
\usepackage{nicematrix}
\begin{document}
\begin{equation}
\begin{pNiceMatrix}[first-row,first-col]
& \Block{1-5}{\mbox{# columns}}\
\Block{5-1}<\rotate>{\mbox{# rows}}
&  1 & 1 & 1 & 0 & 0\
&  0 & 0 & 1 & 0 & 1\
&  0 & 0 & 0 & 0 & 0\
&  1 & 1 & 1 & 0 & 1\
&  1 & 1 & 0 & 0 & 1\
 \end{pNiceMatrix}
\end{equation}
\end{document}

Descriptive text around a matrix

3 Answers3