7

everybody. I was trying to compile a block matrix whose first line has a part that should be centered in that part of the line.

My closest attempt is the code: 

\begin{align}
\mathbf{\hat{F}}_{11}^{(1)-1}
= 
\left[
\begin{array}{c|cc}
0 & \mathbf{1}_{10}& \\
\hline
\mathbf{1}_{10} 
 & 
\mathbf{M}_{11}^{(1)} & 
\mathbf{M}_{11}^{(1)\ast}\mathbf{\bar{I}}_{5} \\
&
\mathbf{\bar{I}}_{5}\mathbf{M}_{11}^{(1)H} &
\mathbf{\bar{I}}_{5}\mathbf{M}_{11}^{(1)}\mathbf{\bar{I}}_{5}\\
\end{array}
\right]
\end{align}

which produce the result:

enter image description here

Ideally, the element $1_{10}$ should be centered in both, line 1 and column 1. Any trick?

Thank you!! :)

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4
  • 1
    Welcome to TeX.SE! You could write \multicolumn{2}{c}{$\mathbf{1}_{10}$} to make $\mathbf{1}_{10}$` straddle columns 2 and 3. Commented May 14, 2014 at 20:08
  • @Mico: The \multicolumn needs to be without the $. Commented May 14, 2014 at 20:14
  • Nice! Thanks @Mico. It works very good. That trick is as simple as useful. Commented May 14, 2014 at 20:19
  • @PeterGrill - Thanks for catching the mistake. I'll post a full answer to mention the correct setup. Commented May 14, 2014 at 20:21

2 Answers 2

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4

I suggest you use \multicolumn{2}{c}{...} to make the \mathbf{1}_{10} in the first row straddle columns 2 and 3. You may also want to load the multirow package and use an instruction such as \multirow{2}{*}{$\mathbf{1}_{10}$} so that the second \mathbf{1}_{10} straddles rows 2 and 3. (Incidentally, should that second \mathbf{1}_{10} term get a transpose symbol attached to it?)

enter image description here

\documentclass{article}
\usepackage{multirow}  % for `\multirow` macro
\begin{document}
\begin{equation}
\hat{\mathbf{F}}_{11}^{(1)-1}
= 
\left[
\begin{array}{c|cc}
0 & \multicolumn{2}{c}{\mathbf{1}_{10}} \\
\hline
\multirow{2}{*}{$\mathbf{1}_{10}$}
 & 
\mathbf{M}_{11}^{(1)} & 
\mathbf{M}_{11}^{(1)\ast}\bar{\mathbf{I}}_{5} \\
&
\bar{\mathbf{I}}_{5}\mathbf{M}_{11}^{(1)H} &
\bar{\mathbf{I}}_{5}\mathbf{M}_{11}^{(1)}\bar{\mathbf{I}}_{5}\\
\end{array}
\right]
\end{equation}
\end{document}
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1

With {pNiceArray} of nicematrix.

\documentclass{article}
\usepackage{nicematrix}

\begin{document}
\begin{equation}
\hat{\mathbf{F}}_{11}^{(1)-1}
= 
\begin{bNiceArray}{c|cc}[margin]
0 & \Block{1-2}{\mathbf{1}_{10}} \\
\hline
\Block{2-1}{\mathbf{1}_{10}}
 & 
\mathbf{M}_{11}^{(1)} & 
\mathbf{M}_{11}^{(1)\ast}\bar{\mathbf{I}}_{5} \\
&
\bar{\mathbf{I}}_{5}\mathbf{M}_{11}^{(1)H} &
\bar{\mathbf{I}}_{5}\mathbf{M}_{11}^{(1)}\bar{\mathbf{I}}_{5}\\
\end{bNiceArray}
\end{equation}

\end{document}

You need several compilations (because nicematrix uses PGF/TikZ nodes under the hood).

Output of the above code

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