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added 14 characters in body
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Torbjørn T.
Torbjørn T.
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\documentclass{article} \usepackage{tikz} \usetikzlibrary{matrix,decorations.pathreplacing, calc, positioning,fit} \begin{document} \begin{equation} Q= \begin{tikzpicture}[ baseline, label distance=10pt % added ] \matrix [matrix of math nodes,left delimiter=(,right delimiter=),row sep=0.1cm,column sep=0.1cm] (m) { 1 & * & * & \dots & * & 0 & \dots & 0 \\ 0 & \pm 1 & * & \dots & * & 0 & \dots & 0 \\ 0 & 0 &\pm 1 & \dots & * & 0 & \dots & 0 \\ \vdots & \vdots & \vdots & \ddots & \vdots & \vdots & \ddots & \vdots\\ 0 & 0 & 0 & \dots &\pm 1& 0 & \dots & 0 \\ 0 & 0 & 0 & \dots & 0 & * & \dots & * \\ \vdots & \vdots & \vdots & \ddots & \vdots & \vdots & \ddots & \vdots\\ 0 & 0 & 0 & 0 & 0 & * & \dots & *\\ }; \draw[dashed] ($0.5*(m-1-5.north east)+0.5*(m-1-6.north west)$) -- ($0.5*(m-8-6.south east)+0.5*(m-8-5.south west)$); \draw[dashed] ($0.5*(m-5-1.south west)+0.5*(m-6-1.north west)$) -- ($0.5*(m-5-8.south east)+0.5*(m-6-8.north east)$); \node[ fit=(m-1-1)(m-1-5), inner xsep=0, above delimiter=\{, label=above:$k_1$]$k_1$ ] {}; \node[ fit=(m-1-6)(m-1-8), inner xsep=0, above delimiter=\{, label=above:$k-k_1$]k_1$  ] {}; \node[ fit=(m-1-8)(m-5-8), inner xsep=15pt,inner ysep=0, right delimiter=\}, label=right:$k_1$ ] {}; \node[ fit=(m-6-8)(m-8-8), inner xsep=15pt,inner ysep=0, right delimiter=\}, label=right:$k-k_1$ ] {}; \end{tikzpicture} \end{equation} \end{document} 
\documentclass{article} \usepackage{tikz} \usetikzlibrary{matrix,decorations.pathreplacing, calc, positioning,fit} \begin{document} \begin{equation} Q= \begin{tikzpicture}[ baseline, label distance=10pt % added ] \matrix [matrix of math nodes,left delimiter=(,right delimiter=),row sep=0.1cm,column sep=0.1cm] (m) { 1 & * & * & \dots & * & 0 & \dots & 0 \\ 0 & \pm 1 & * & \dots & * & 0 & \dots & 0 \\ 0 & 0 &\pm 1 & \dots & * & 0 & \dots & 0 \\ \vdots & \vdots & \vdots & \ddots & \vdots & \vdots & \ddots & \vdots\\ 0 & 0 & 0 & \dots &\pm 1& 0 & \dots & 0 \\ 0 & 0 & 0 & \dots & 0 & * & \dots & * \\ \vdots & \vdots & \vdots & \ddots & \vdots & \vdots & \ddots & \vdots\\ 0 & 0 & 0 & 0 & 0 & * & \dots & *\\ }; \draw[dashed] ($0.5*(m-1-5.north east)+0.5*(m-1-6.north west)$) -- ($0.5*(m-8-6.south east)+0.5*(m-8-5.south west)$); \draw[dashed] ($0.5*(m-5-1.south west)+0.5*(m-6-1.north west)$) -- ($0.5*(m-5-8.south east)+0.5*(m-6-8.north east)$); \node[ fit=(m-1-1)(m-1-5), inner xsep=0, above delimiter=\{, label=above:$k_1$] {}; \node[ fit=(m-1-6)(m-1-8), inner xsep=0, above delimiter=\{, label=above:$k-k_1$] {}; \node[ fit=(m-1-8)(m-5-8), inner xsep=15pt,inner ysep=0, right delimiter=\}, label=right:$k_1$ ] {}; \node[ fit=(m-6-8)(m-8-8), inner xsep=15pt,inner ysep=0, right delimiter=\}, label=right:$k-k_1$ ]{}; \end{tikzpicture} \end{equation} \end{document} 
\documentclass{article} \usepackage{tikz} \usetikzlibrary{matrix,decorations.pathreplacing, calc, positioning,fit} \begin{document} \begin{equation} Q= \begin{tikzpicture}[ baseline, label distance=10pt % added ] \matrix [matrix of math nodes,left delimiter=(,right delimiter=),row sep=0.1cm,column sep=0.1cm] (m) { 1 & * & * & \dots & * & 0 & \dots & 0 \\ 0 & \pm 1 & * & \dots & * & 0 & \dots & 0 \\ 0 & 0 &\pm 1 & \dots & * & 0 & \dots & 0 \\ \vdots & \vdots & \vdots & \ddots & \vdots & \vdots & \ddots & \vdots\\ 0 & 0 & 0 & \dots &\pm 1& 0 & \dots & 0 \\ 0 & 0 & 0 & \dots & 0 & * & \dots & * \\ \vdots & \vdots & \vdots & \ddots & \vdots & \vdots & \ddots & \vdots\\ 0 & 0 & 0 & 0 & 0 & * & \dots & *\\ }; \draw[dashed] ($0.5*(m-1-5.north east)+0.5*(m-1-6.north west)$) -- ($0.5*(m-8-6.south east)+0.5*(m-8-5.south west)$); \draw[dashed] ($0.5*(m-5-1.south west)+0.5*(m-6-1.north west)$) -- ($0.5*(m-5-8.south east)+0.5*(m-6-8.north east)$); \node[ fit=(m-1-1)(m-1-5), inner xsep=0, above delimiter=\{, label=above:$k_1$ ] {}; \node[ fit=(m-1-6)(m-1-8), inner xsep=0, above delimiter=\{, label=above:$k-k_1$  ] {}; \node[ fit=(m-1-8)(m-5-8), inner xsep=15pt,inner ysep=0, right delimiter=\}, label=right:$k_1$ ] {}; \node[ fit=(m-6-8)(m-8-8), inner xsep=15pt,inner ysep=0, right delimiter=\}, label=right:$k-k_1$ ] {}; \end{tikzpicture} \end{equation} \end{document}
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Torbjørn T.
Torbjørn T.
  • 211.4k
  • 15
  • 412
  • 591

You're nesting tikzpictures, that is often a bad idea. Here's an alternative approach using the fit library.

enter image description here

\documentclass{article} \usepackage{tikz} \usetikzlibrary{matrix,decorations.pathreplacing, calc, positioning,fit} \begin{document} \begin{equation} Q= \begin{tikzpicture}[ baseline, label distance=10pt % added ] \matrix [matrix of math nodes,left delimiter=(,right delimiter=),row sep=0.1cm,column sep=0.1cm] (m) { 1 & * & * & \dots & * & 0 & \dots & 0 \\ 0 & \pm 1 & * & \dots & * & 0 & \dots & 0 \\ 0 & 0 &\pm 1 & \dots & * & 0 & \dots & 0 \\ \vdots & \vdots & \vdots & \ddots & \vdots & \vdots & \ddots & \vdots\\ 0 & 0 & 0 & \dots &\pm 1& 0 & \dots & 0 \\ 0 & 0 & 0 & \dots & 0 & * & \dots & * \\ \vdots & \vdots & \vdots & \ddots & \vdots & \vdots & \ddots & \vdots\\ 0 & 0 & 0 & 0 & 0 & * & \dots & *\\ }; \draw[dashed] ($0.5*(m-1-5.north east)+0.5*(m-1-6.north west)$) -- ($0.5*(m-8-6.south east)+0.5*(m-8-5.south west)$); \draw[dashed] ($0.5*(m-5-1.south west)+0.5*(m-6-1.north west)$) -- ($0.5*(m-5-8.south east)+0.5*(m-6-8.north east)$); \node[ fit=(m-1-1)(m-1-5), inner xsep=0, above delimiter=\{, label=above:$k_1$] {}; \node[ fit=(m-1-6)(m-1-8), inner xsep=0, above delimiter=\{, label=above:$k-k_1$] {}; \node[ fit=(m-1-8)(m-5-8), inner xsep=15pt,inner ysep=0, right delimiter=\}, label=right:$k_1$ ] {}; \node[ fit=(m-6-8)(m-8-8), inner xsep=15pt,inner ysep=0, right delimiter=\}, label=right:$k-k_1$ ]{}; \end{tikzpicture} \end{equation} \end{document}