1

How can I achieve the following big sigma and big zero in a matrix:

enter image description here

Each of the symbols are there in place of a group of matrix elements and not one element. Suppose we divide matrix into two sections (column-wise), one section is called $\sigma$ and the other is showing that all elements are zero (hence a bog zero). So the following small equation is not what I need:

\documentclass{article}
\usepackage{amsmath}

\begin{document}
\[
\begin{bmatrix}\sum 0 \end{bmatrix}
\]
\end{document}
  • \LARGE, \huge and similars are not working? – Guilherme Zanotelli Sep 19 '16 at 5:14
  • Are you looking for \displaystyle\sum? – Heiko Oberdiek Sep 19 '16 at 5:41
  • You should use \Sigma not \sum e.g. \begin{bmatrix}\Sigma & 0 \end{bmatrix} and it would help if you explained why you don't need your mwe. – Manuel Schmidt Sep 19 '16 at 5:43
  • Edited the question to add more details of what the desired output should be and what it looks like. @ManuelSchmidt – Gigili Sep 19 '16 at 5:59
  • @HeikoOberdiek Edited the question. Hope it is clear now. – Gigili Sep 19 '16 at 6:00
2

Something like the following, maybe? (Feel free to change the sizes of the symbols by adjusting the first argument of the \scalebox directives.)

enter image description here

\documentclass{article}
\usepackage{amsmath}  % for 'bmatrix' environment
\usepackage{graphicx} % for '\scalebox' macro
\newcommand\humongousZero{\scalebox{3}{$0$}}
\newcommand\humongousSigma{\scalebox{3}{$\Sigma$}}

\begin{document}
\[
abc 
    \begin{bmatrix}  
    & & & & \\
    & \humungousSigma & & \humungousZero & \\
    & & & &
    \end{bmatrix} 
xyz
\]
\end{document}
1

Is this what you are looking for?

\documentclass{article}
\usepackage{amsmath}

\newcommand\bigZero{\mbox{\huge$0$}}
\newcommand\bigSigma{\mbox{\huge$\Sigma$}}
\begin{document}
\[
\begin{bmatrix} \bigSigma & \bigZero \end{bmatrix}
\]
\end{document}

For getting arbitrary font size, you can extend the definition, but you also need to enable arbitrary font scaling.

\RequirePackage{fix-cm}

\documentclass{article}
\usepackage{amsmath}

\DeclareFontShape{OMX}{cmex}{m}{n}{
  <-7.5>    cmex7
  <7.5-8.5> cmex8
  <8.5-9.5> cmex9
  <9.5->    cmex10
}{}


\newcommand\bigZero[1][17]{\mbox{\fontsize{#1}{0}\selectfont$0$}}
\newcommand\bigSigma[1][17]{\mbox{\fontsize{#1}{0}\selectfont$\Sigma$}}
\begin{document}
\[
A=\begin{bmatrix} \bigSigma & \bigZero \end{bmatrix}\qquad
B=\begin{bmatrix} \bigSigma[48] & \bigZero[48] \end{bmatrix}
\]
\end{document}

enter image description here

  • Sort of. Couldn't it get any bigger than that? A big $m \times n$ matrix? – Gigili Sep 19 '16 at 6:26

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