[Tex/LaTex] How to represent the following math equation (border matrix) in Latex

bordermatrixequationsmath-mode

I am frustrated in setting the above attached picture to my manuscript. All things are feasible by using the \begin{cases} or matrices environment. The placing of T1, T2, … , Tn and V1, V2, …, Vn in the respective columns and rows are quite disgusting. Please Help through suggesting how to represent the following.

Furthermore, is there exist anyway to place a big left brace, bigger than even the size of \Biggl. I have tried all combinations, but fail to produce the desire output.

Thank You in Advance.

Best Answer

One option using blkarray:

\documentclass{article}
\usepackage{blkarray}
\usepackage{amsmath}

\begin{document}

\[
ETC_{ij}=
\begin{blockarray}{ccccc}
 & V_{1} & V_{2} & \cdots & V_{m} \\
\begin{block}{c\{cccc}
  T_{1} & ETC_{11} & ETC_{12} & \cdots & ETC_{1m} \\
  T_{2} & ETC_{21} & ETC_{22} & \cdots & ETC_{2m} \\
  \vdots & \vdots & \vdots & \vdots & \vdots \\
  T_{n} & ETC_{n1} & ETC_{n2} & \cdots & ETC_{nm} \\
\end{block}
\end{blockarray}
 \]

\end{document}

As Bernard mentions in his comment, suppressing some horizontal spacing with @{} at the beginning of the blocks, and increasing the value of \arraystretch improves the result:

\documentclass{article}
\usepackage{blkarray}
\usepackage{amsmath}

\begin{document}

\[
\renewcommand\arraystretch{1.3}
ETC_{ij}=
\begin{blockarray}{ccccc}
 & V_{1} & V_{2} & \cdots & V_{m} \\
\begin{block}{@{}c\{cccc}
  T_{1} & ETC_{11} & ETC_{12} & \cdots & ETC_{1m} \\
  T_{2} & ETC_{21} & ETC_{22} & \cdots & ETC_{2m} \\
  \vdots & \vdots & \vdots & \vdots & \vdots \\
  T_{n} & ETC_{n1} & ETC_{n2} & \cdots & ETC_{nm} \\
\end{block}
\end{blockarray}
 \]

\end{document}

Related Solutions

[Tex/LaTex] Nested matrices with aligned columns and rows

You could use the blkarray package:

\documentclass{article}
\usepackage{amsmath}
\usepackage{blkarray}

\begin{document}

\[
\Gamma^{\sigma}_{\mu \nu} = 
\left(
\begin{blockarray}{ ccc }
\begin{block}{( ccc )}
  0 & 0 & 0 \\
  0 & -r & 0 \\
  0 & 0 & -r \sin^2(\vartheta) \\
\end{block}
\begin{block}{( ccc )}
  0 & \frac{1}{r} & 0 \\
  \frac{1}{r} & 0 & 0 \\
  0 & 0 & - \sin(\vartheta) \cos(\vartheta) \\
\end{block}
\begin{block}{( ccc )}
  0 & 0 & \frac{1}{r} \\[1ex]
  0 & 0 & \frac{1}{\tan(\vartheta)} \\[1ex]
  \frac{1}{r} & \frac{1}{\tan(\vartheta)} & 0 \\
\end{block}
\end{blockarray}
\right)
\]

\end{document}

enter image description here

[Tex/LaTex] Problems with centering a border matrix

Put \bordermatrix inside

\[
\]

and make it a display equation.

\documentclass{article}
\usepackage{amsmath,braket}
\newcommand{\dirint}{\int}    %% just for compiling, change it in your file
\begin{document}
  \begin{figure}[h!]
\[
 \bordermatrix{~& \ket{\Phi_{0}} & \ket{S} & \ket{D} & \ket{T} & \ket{Q} & \dots \cr
 \bra{\Phi_{0}} & E_{0} & \textbf{0} & \dirint{\Phi_{0}}{\hat{H}}{D} & \textbf{0} & \textbf{0} & \dots \cr
 \bra{S} &  & \dirint{S}{\hat{H}}{S} & \dirint{S}{\hat{H}}{D} & \dirint{S}{\hat{H}}{T} & \textbf{0} & \dots \cr
 \bra{D} &  &  & \dirint{D}{\hat{H}}{D} & \dirint{D}{\hat{H}}{T} & \dirint{D}{\hat{H}}{Q} & \dots \cr
 \bra{T} &  &  &  & \dirint{T}{\hat{H}}{T} & \dirint{T}{\hat{H}}{Q} & \dots \cr
 \bra{Q} &  &  &  &  & \dirint{Q}{\hat{H}}{Q} & \dots \cr
 \vdots  &  &  &  &  &  & \ddots \cr}
 \]
\caption{Structure of the full-CI matrix. The matrix is hermitian, therefore, only the
upper triangle is shown. The multitudes of singly, doubly, triply, etc. excited determinants
are denoted as $\ket{S}$, $\ket{D}$, $\ket{T}$, etc.}
\label{fig:FCI_mat}
\end{figure}
\end{document}

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] Nested matrices with aligned columns and rows

[Tex/LaTex] Problems with centering a border matrix

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