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changed matrix form to diagonal braces

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Martin Thoma 2012-09-02 20:39:52 +02:00
parent 2150fa216b
commit 21578e8a18
2 changed files with 33 additions and 28 deletions
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1
documents/math-sylvester-diagonal-matrix/Makefile
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@ -4,6 +4,7 @@ DENSITY = 300
WIDTH = 500
make:
pdflatex $(SOURCE).tex -output-format=pdf
pdflatex $(SOURCE).tex -output-format=pdf
make clean

58
documents/math-sylvester-diagonal-matrix/math-sylvester-diagonal-matrix.tex
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@ -3,39 +3,43 @@
\setlength\PreviewBorder{0mm}
\usepackage{amsmath,array}
\renewcommand\arraycolsep{4pt} % default value: 6pt
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}
\setlength\arraycolsep{4pt} % default value: 6pt
\newcommand\tikzmark[1]{%
\tikz[overlay,remember picture,baseline] \coordinate [anchor=base] (#1);}
\newcommand\DrawBrace[3]{%
\draw [decorate,decoration={brace,amplitude=2pt,mirror,raise=2pt}]
(#1) -- (#2) node [black,midway,sloped,yshift=-10pt] {\footnotesize$#3$};
}
\begin{document}
\begin{preview}
\begin{equation*}
S^T \cdot A \cdot S =
\left( \,
\begin{array}{r@{}r@{}r r r} % @{} is used twice to suppress intercolumn whitespace
\underbrace{
\begin{array}{rrr} % First block (1)
1 & & \\
& \ddots & \\
& & 1 \\
\end{array}
}_{r_+(s)-mal}\\
&
\underbrace{
\begin{array}{rrr} % Second block (-1)
-1 & & \\
& \ddots & \\
& & -1\\
\end{array}
}_{r_{-}(s)-mal} \\
& &
\underbrace{
\begin{array}{rrr} % Third block
0 & & \\
& \ddots & \\
& & 0\\
\end{array}
}_{r_0(s)-mal} \\
\end{array}\,\right)
\left(
\begin{array}{*{9}{c}}
\tikzmark{a}1 \\
& \ddots & \\
& & \tikzmark{b}1 \\
& & & \tikzmark{c}-1 \\
& & & & \ddots & \\
& & & & & \tikzmark{d}-1\\
& & & & & & \tikzmark{e}\phantom{-}0 \\
& & & & & & & \ddots & \\
& & & & & & & & \tikzmark{f}\phantom{-}0 \\
\end{array}
\right)
\end{equation*}
\begin{tikzpicture}[remember picture,overlay]
\DrawBrace{a}{b}{r_{+}(s)-mal}
\DrawBrace{c}{d}{r_{-}(s)-mal}
\DrawBrace{e}{f}{r_{0}(s)-mal}
\end{tikzpicture}
\end{preview}
\end{document}