8

I want to add some over-braces to a matrix to get the following output:

enter image description here

However, this this what I managed to get:

enter image description here

I don't know how to get the neuron 1 and neuron 2 headings...I was thinking of overbraces but not sure how to use it in this case. The stuff on the right of the matrix is not aligned properly...My equation number is moving to the next line as well..Can anyone help me please.

My code is as follows (I am using amsmath package):

    \begin{equation}

    \begin{matrix}
     J
     =
     \begin{bmatrix}
     \frac{\delta e_{1,1}}{\delta w_{1,1}}  & \frac{\delta e_{1,1}}{\delta w_{1,2}} &
     \cdots & \frac{\delta e_{1,1}}{\delta w_{j,1}}  & \cdots \\[0.5em]

     \frac{\delta e_{1,2}}{\delta w_{1,1}}  & \frac{\delta e_{1,2}}{\delta w_{1,2}} & 
     \cdots & \frac{\delta e_{1,2}}{\delta w_{j,1}}  & \cdots \\[0.5em]

     \cdots & \cdots & \cdots &
     \cdots & \cdots \\[0.5em]

     \frac{\delta e_{1,M}}{\delta w_{1,1}}  & \frac{\delta e_{1,M}}{\delta w_{1,2}} & 
     \cdots & \frac{\delta e_{1,M}}{\delta w_{j,1}}  & \cdots \\[0.5em]

     \cdots & \cdots & \cdots &
     \cdots & \cdots \\[0.5em]

     \frac{\delta e_{P,1}}{\delta w_{1,1}}  & \frac{\delta e_{P,1}}{\delta w_{1,2}} & 
     \cdots & \frac{\delta e_{P,1}}{\delta w_{j,1}}  & \cdots \\[0.5em]

     \frac{\delta e_{P,1}}{\delta w_{1,1}}  & \frac{\delta e_{np,2}}{\delta w_{1,2}} &
     \cdots & \frac{\delta e_{P,2}}{\delta w_{j,1}}  & \cdots \\[0.5em]

     \cdots & \cdots & \cdots &
     \cdots & \cdots \\[0.5em]

      \frac{\delta e_{P,M}}{\delta w_{1,1}}  & \frac{\delta e_{P,M}}{\delta w_{1,2}} & 
      \cdots & \frac{\delta e_{P,M}}{\delta w_{j,1}}  & \cdots \\[0.5em]
      \end{bmatrix} %\!\! 
      \begin{aligned}
      &\left.\begin{matrix}
      m = 1  \\[0.5em]
      m = 2  \\[0.5em]
      \cdots \\[0.5em]
      m = M  \\[0.5em]
      \end{matrix} \right\} %
      p = 1\\
      &\begin{matrix}
      \phantom{\cdots}\cdots\\[0.5em]
      \end{matrix}\\ %
      &\left.\begin{matrix}
      m = 1  \\[0.5em]
      m = 2  \\[0.5em]
      \cdots \\[0.5em]
      m = M\\[0.5em]
      \end{matrix}\right\}%
      p = P\\
     \end{aligned}
     \end{matrix}
     \end{equation}
7

Here's one (TikZ-free) possibility; \overmat writes its first argument above the entries enclosed in the second argument; \bovermat (in the second example below) acts analogously, but showing an overbrace. I also fixed the alignment of the expressions to the right using some phantoms:

\documentclass{article}
\usepackage{amsmath}
\usepackage{xcolor}

\newcommand\overmat[2]{%
  \makebox[0pt][l]{$\smash{\color{white}\overbrace{\phantom{%
    \begin{matrix}#2\end{matrix}}}^{\text{\color{black}#1}}}$}#2}
\newcommand\partialphantom{\vphantom{\frac{\partial e_{P,M}}{\partial w_{1,1}}}}

\begin{document}

\begin{equation}
\begin{matrix}
 J
 =
 \begin{bmatrix}
 \overmat{neuron 1}{\frac{\partial e_{1,1}}{\partial w_{1,1}}  & \frac{\partial e_{1,1}}{\partial w_{1,2}}} &
 \overmat{$\mkern-3.5mu\cdots$}{\cdots} & \overmat{neuron $j$}{\frac{\partial e_{1,1}}{\partial w_{j,1}} & \frac{\partial e_{1,1}}{\partial w_{j,1}}} & \cdots \\[0.5em]
%
 \frac{\partial e_{1,2}}{\partial w_{1,1}}  & \frac{\partial e_{1,2}}{\partial w_{1,2}} & 
 \cdots & \frac{\partial e_{1,2}}{\partial w_{j,1}}  & \cdots \\[0.5em]
%
 \cdots & \cdots & \cdots &
 \cdots & \cdots \\[0.5em]
%
 \frac{\partial e_{1,M}}{\partial w_{1,1}}  & \frac{\partial e_{1,M}}{\partial w_{1,2}} & 
 \cdots & \frac{\partial e_{1,M}}{\partial w_{j,1}}  & \cdots \\[0.5em]
%
 \cdots & \cdots & \cdots &
 \cdots & \cdots \\[0.5em]
%
 \frac{\partial e_{P,1}}{\partial w_{1,1}}  & \frac{\partial e_{P,1}}{\partial w_{1,2}} & 
 \cdots & \frac{\partial e_{P,1}}{\partial w_{j,1}}  & \cdots \\[0.5em]
%
 \frac{\partial e_{P,1}}{\partial w_{1,1}}  & \frac{\partial e_{np,2}}{\partial w_{1,2}} &
 \cdots & \frac{\partial e_{P,2}}{\partial w_{j,1}}  & \cdots \\[0.5em]
%
 \cdots & \cdots & \cdots &
 \cdots & \cdots \\[0.5em]
%
  \frac{\partial e_{P,M}}{\partial w_{1,1}}  & \frac{\partial e_{P,M}}{\partial w_{1,2}} & 
  \cdots & \frac{\partial e_{P,M}}{\partial w_{j,1}}  & \cdots \\[0.5em]
  \end{bmatrix}
  \begin{aligned}
  &\left.\begin{matrix}
  \partialphantom m = 1  \\[0.5em]
  \partialphantom m = 2  \\[0.5em]
  \cdots \\[0.5em]
  \partialphantom m = M  \\[0.5em]
  \end{matrix} \right\} %
  p = 1\\
  &\begin{matrix}
  \\[-1.67em]\phantom{\cdots}\cdots
  \end{matrix}\\ %
  &\left.\begin{matrix}
  \partialphantom m = 1  \\[0.5em]
  \partialphantom m = 2  \\[0.5em]
  \cdots \\[0.5em]
  \partialphantom m = M\\[0.5em]
  \end{matrix}\right\}%
  p = P\\
 \end{aligned}
 \end{matrix}
 \end{equation}

\end{document}

enter image description here

And a variation with braces:

\documentclass{article}
\usepackage{amsmath}
\usepackage{xcolor}

\newcommand\overmat[2]{%
  \makebox[0pt][l]{$\smash{\color{white}\overbrace{\phantom{%
    \begin{matrix}#2\end{matrix}}}^{\text{\color{black}#1}}}$}#2}
\newcommand\bovermat[2]{%
  \makebox[0pt][l]{$\smash{\overbrace{\phantom{%
    \begin{matrix}#2\end{matrix}}}^{\text{#1}}}$}#2}
\newcommand\partialphantom{\vphantom{\frac{\partial e_{P,M}}{\partial w_{1,1}}}}

\begin{document}

\begin{equation}
\begin{matrix}
 J
 =
 \begin{bmatrix}
 \bovermat{neuron 1}{\frac{\partial e_{1,1}}{\partial w_{1,1}}  & \frac{\partial e_{1,1}}{\partial w_{1,2}}} &
 \overmat{$\mkern-3.5mu\cdots$}{\cdots} & \bovermat{neuron $j$}{\frac{\partial e_{1,1}}{\partial w_{j,1}} & \frac{\partial e_{1,1}}{\partial w_{j,1}}} & \cdots \\[0.5em]
%
 \frac{\partial e_{1,2}}{\partial w_{1,1}}  & \frac{\partial e_{1,2}}{\partial w_{1,2}} & 
 \cdots & \frac{\partial e_{1,2}}{\partial w_{j,1}}  & \cdots \\[0.5em]
%
 \cdots & \cdots & \cdots &
 \cdots & \cdots \\[0.5em]
%
 \frac{\partial e_{1,M}}{\partial w_{1,1}}  & \frac{\partial e_{1,M}}{\partial w_{1,2}} & 
 \cdots & \frac{\partial e_{1,M}}{\partial w_{j,1}}  & \cdots \\[0.5em]
%
 \cdots & \cdots & \cdots &
 \cdots & \cdots \\[0.5em]
%
 \frac{\partial e_{P,1}}{\partial w_{1,1}}  & \frac{\partial e_{P,1}}{\partial w_{1,2}} & 
 \cdots & \frac{\partial e_{P,1}}{\partial w_{j,1}}  & \cdots \\[0.5em]
%
 \frac{\partial e_{P,1}}{\partial w_{1,1}}  & \frac{\partial e_{np,2}}{\partial w_{1,2}} &
 \cdots & \frac{\partial e_{P,2}}{\partial w_{j,1}}  & \cdots \\[0.5em]
%
 \cdots & \cdots & \cdots &
 \cdots & \cdots \\[0.5em]
%
  \frac{\partial e_{P,M}}{\partial w_{1,1}}  & \frac{\partial e_{P,M}}{\partial w_{1,2}} & 
  \cdots & \frac{\partial e_{P,M}}{\partial w_{j,1}}  & \cdots \\[0.5em]
  \end{bmatrix}
  \begin{aligned}
  &\left.\begin{matrix}
  \partialphantom m = 1  \\[0.5em]
  \partialphantom m = 2  \\[0.5em]
  \cdots \\[0.5em]
  \partialphantom m = M  \\[0.5em]
  \end{matrix} \right\} %
  p = 1\\
  &\begin{matrix}
  \\[-1.67em]\phantom{\cdots}\cdots
  \end{matrix}\\ %
  &\left.\begin{matrix}
  \partialphantom m = 1  \\[0.5em]
  \partialphantom m = 2  \\[0.5em]
  \cdots \\[0.5em]
  \partialphantom m = M\\[0.5em]
  \end{matrix}\right\}%
  p = P\\
 \end{aligned}
 \end{matrix}
 \end{equation}

\end{document}

enter image description here

  • This is great...Just what I was looking for in the first place... I already managed to solve it using TikZ based on the comments on the question and How to Specify two level row and column labels of a matrix by braces?...But I will mark this as answer...not many solutions out there without TikZ...This will be useful to people like me..who never used TikZ before..Thanks again. – Saed Apr 11 '13 at 19:30
  • Quick question...What does the xcolor package do here? – Saed Apr 11 '13 at 19:39
  • @Saed You're welcome! Yes, TikZ is powerful, but some things can be done without it :-) Regarding your question, the difference between \overmat and \bovermat is simply that the former typesets the overbace in white color. – Gonzalo Medina Apr 11 '13 at 19:48
0

I didn't use your matrix but I think my example would help our community.

\documentclass{article}
\usepackage{amsmath}

\[
\begin{array}{| c | c | c | c | c | c | c | c | c | c |}
\multicolumn{3}{c}{\rho_1 } &
\multicolumn{3}{c}{\rho_2} &
\multicolumn{1}{c}{ \ }   & 
\multicolumn{3}{c}{\rho_k} \\
%
\multicolumn{3}{c}{\overbrace{\rule{4cm}{0pt}}} &
\multicolumn{3}{c}{\overbrace{\rule{4cm}{0pt}}} &
\multicolumn{1}{c}{ \ }   & 
\multicolumn{3}{c}{\overbrace{\rule{4cm}{0pt}}} \\[-3pt]
\hline
p(t_1) & \cdots & p^{(\rho_1-1)}(t_1) & p(t_2) & \cdots & 
p^{(\rho_2-1)}(t_2) & \cdots  & p(t_k) & \cdots & 
p^{(\rho_k-1)}(t_k) \\
\hline
\end{array}
\] 

\end{document}
  • 1
    Welcome to TeX.SE! Can you please add an screenshot of your resulting pdf to your answer? For a fast proof ... – Mensch Feb 17 at 1:34

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