# [OS X TeX] Vertical Spacing in "bmatrix" environment

Michael Hoppe mh at michael-hoppe.de
Wed Nov 12 12:34:59 CET 2008

Am 12.11.2008 um 11:34 schrieb Themis Matsoukas:
> $> \renewcommand{\arraystretch}{2} > \begin{bmatrix} > \frac{s+5}{s^2+5s+4} \\ > \frac{-1}{s^2+5s+4} > \end{bmatrix} >$

The brackets are too big.  Compare all solutions listed so far:

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{amsmath}
\def\tabkor{\vphantom{\Bigl(}}
\begin{document}
\Huge
$$\begin{bmatrix} \tabkor\frac{s+5}{s^2+5s+4} \\ \tabkor\frac{-1}{s^2+5s+4} \end{bmatrix}$$

\begin{bmatrix} \frac{s+5}{s^2+5s+4} \\ \frac{-1}{s^2+5s+4} \end{bmatrix} \begin{bmatrix} \frac{s+5}{s^2+5s+4} \\ \noalign{\smallskip} \frac{-1}{s^2+5s+4} \end{bmatrix}

$$\begin{bmatrix} \frac{s+5}{s^2+5s+4} \\[2ex] \frac{-1}{s^2+5s+4} \end{bmatrix} \renewcommand{\arraystretch}{2} \begin{bmatrix} \frac{s+5}{s^2+5s+4} \\ \frac{-1}{s^2+5s+4} \end{bmatrix}$$
\end{document}

You might want to use \dfrac instead of \frac; then define

\def\dtabkor{\vphantom{\biggl(}}

and use it like this:

$$\begin{bmatrix} \dtabkor\dfrac{s+5}{s^2+5s+4} \\ \dtabkor\dfrac{-1}{s^2+5s+4} \end{bmatrix}$$

Michael