Math & Science ⇒ Improving a Matrix

[Lucasqcgroup]

Dear all,

I'm trying to type the following matrix:

matrixf.png (3.24 KiB) Viewed 3460 times

But I could only get this:

mymatrix.png (10.32 KiB) Viewed 3460 times

I used the following code:

Code: Select all

\renewcommand{\arraystretch}{2}
\[
g :=\left(
\begin{array}{c|c}
\mathbf{2^D} & \textbf{1} \\ \hline
\textbf{1} & \begin{array}{cc}
\boldsymbol{1^\alpha} & \textbf{0} \\
\textbf{0} & \boldsymbol{1^\beta}
\end{array} \\ 
\end{array}
\right)
\]

There is too much space between the entries of the matrix and the vertical and horizontal lines.

How could I improve my matrix [typeset it correctly] ?

Any help would be greatly appreciated.

[percusse]

You might better avoid the nesting of arrays as much as you can in order to avoid such spacing and padding problems.

Here is something that comes to close to the given example. You can still modify the array stretch to 1.3 or higher, alternatively add some \mathstruts etc. I recommend reading Hendrik Vogt's nice answer on TeX.sx.

Code: Select all

\documentclass{article}
\usepackage{amsmath,array,multirow}

\begin{document}
    \[
    g :=\left(
    \begin{array}{c|cc}
    2^D                & \multicolumn{2}{c}{1} \\ \hline
    \multirow{2}{*}{1} & 1^\alpha              & 0 \\
                       & 0                     & 1^\beta
    \end{array}
    \right)
    \]   
\end{document}