8

I am trying to create this matrix in Microsoft word 2010 with mathtype and since mathtype just uses the amsmath package, I should only use this pckage in my latex code. Can anyone tell me what code should I use?

enter image description here

10

You can, with some tricks:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\[
\boldsymbol{O}_{4}(2\phi)=
\begin{bmatrix}
1 & \mspace{-12mu} \begin{matrix} 0 & 0 & 0 \end{matrix} \\
\begin{matrix} 0 \\ 0 \\ 0 \end{matrix} &
\mspace{-12mu}
\begin{bmatrix}
  \vphantom{\begin{matrix} 0 \\ 0 \\ 0 \end{matrix}}
  \boldsymbol{O}_{3}(2\phi)
\end{bmatrix}
\end{bmatrix}
\]

\end{document}

The main trick is nesting matrices; but it's also necessary to compensate the space of the inner left bracket, which I do with the \mspace{-12mu} commands.

enter image description here

  • can you please explain more about this line? \vphantom{\begin{matrix} 0 \\ 0 \\ 0 \end{matrix}} what does vphantom do? also from \begin{matrix} 0 \\ 0 \\ 0 \end{matrix} seems that you have created a 3x1 matrix as the inner matrix not a 3x3 matrix?!!! – Sepideh Abadpour Aug 15 '15 at 9:44
  • 1
    @sepideh The phantom makes the inner bmatrix as high as the column of zeros; the outer bmatrix has two columns. – egreg Aug 15 '15 at 11:19
  • I mean the inner bmatrix has just 1 column – Sepideh Abadpour Aug 15 '15 at 11:20
  • 2
    @sepideh Yes, of course: you just want one object in it, don't you? – egreg Aug 15 '15 at 11:26
6

Here is a solution, based on blkarray, multirow and \bigstrut:

\documentclass{book}
\usepackage{amsmath, bm}
\usepackage{blkarray, multirow, bigstrut}

\newcommand\mystrut[1][0.6ex]{\setlength\bigstrutjot{#1}{\bigstrut[t]}}
\usepackage{bm}
\begin{document}

\[ \bm{O}_4(2\phi) =
\begin{bmatrix}
\!\!\!\begin{blockarray}{c c c c}
    1 & 0 & 0 & 0 \mystrut\\
    \begin{block}{c [c c c]}
    0 & \BAmulticolumn{3}{c}{\multirow{3}{*}{$\bm{O}_3(2\phi)$}}\\
    0 & \\
    0 &\\
    \end{block}
\end{blockarray}
\!\vspace{-1.8ex} \end{bmatrix}
\]

\end{document} 

enter image description here

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