How to stretch delimiters to envolve matrices inside of a kbordermatrix?

Question

I am putting three matrices inside of a kbordermatrix, but the delimiters do not envolve the inner matrices completely. How can I do to stretch the kbordermatrix delimiters to envolve the inner matrices?

My MWE:

\documentclass[brazil]{article}



\usepackage{amsfonts,amssymb,array,mathtools}
\usepackage{kbordermatrix}



\begin{document}

\begin{eqnarray} 
    \mathbf{A} & = & 
    \setlength{\kbrowsep}{2pt}
    \setlength{\kbcolsep}{0pt}
    \renewcommand{\arraystretch}{1.5}
    \renewcommand{\kbldelim}{(}
    \renewcommand{\kbrdelim}{)}
    \kbordermatrix{
        \omit & & , & & , & \cr
        \omit & \overbrace{\begingroup
            \setlength{\arraycolsep}{2.5pt}
            \begin{bmatrix}
            0,9960 & -0,0037    \\
            0,0111 &  0,9867        
            \end{bmatrix}
            \endgroup} & , & \overbrace{\begingroup
            \setlength{\arraycolsep}{2.5pt}
            \begin{bmatrix}
            0,9961 & -0,0059    \\
            0,0715 &  1,0423
            \end{bmatrix}
            \endgroup} & , & \overbrace{\begingroup
            \setlength{\arraycolsep}{2.5pt}
            \begin{bmatrix}
            1,0034 & 0,0009     \\
            0,0098 & 0,9696
            \end{bmatrix}
            \endgroup}
    } \nonumber
\end{eqnarray}


\end{document}

The execution results of aforementioned code:

P.S.: I would like to stretch the delimiters until the red arrows.

What's the purpose of those commas hanging from nowhere? – egreg Apr 14 '19 at 09:19 — egreg, Apr 14 '19 at 09:19

score 3 · Answer 1 · answered Apr 13 '19 at 22:27

Turn off \arraystretch. Then, manually, add the desired space between rows.

\documentclass[brazil]{article}

\usepackage{amsfonts,amssymb,array,mathtools}
\usepackage{kbordermatrix}

\begin{document}
\begin{eqnarray} 
    \mathbf{A} & = & 
    \setlength{\kbrowsep}{2pt}
    \setlength{\kbcolsep}{0pt}
%    \renewcommand{\arraystretch}{1.5}
    \renewcommand{\kbldelim}{(}
    \renewcommand{\kbrdelim}{)}
    \kbordermatrix{
        \omit & & , & & , & \cr
        \omit & \overbrace{\begingroup
            \setlength{\arraycolsep}{2.5pt}
            \begin{bmatrix}
            0,9960 & -0,0037    \\[2ex]
            0,0111 &  0,9867        
            \end{bmatrix}
            \endgroup} & , & \overbrace{\begingroup
            \setlength{\arraycolsep}{2.5pt}
            \begin{bmatrix}
            0,9961 & -0,0059    \\[2ex]
            0,0715 &  1,0423
            \end{bmatrix}
            \endgroup} & , & \overbrace{\begingroup
            \setlength{\arraycolsep}{2.5pt}
            \begin{bmatrix}
            1,0034 & 0,0009     \\[2ex]
            0,0098 & 0,9696
            \end{bmatrix}
            \endgroup}
    } \nonumber
\end{eqnarray}

\end{document}

@StevenSegletes, I tested your solution and it worked fine. Thank you by help. — Adriano, Apr 14 '19 at 00:33

Bernard · Accepted Answer · 2019-04-14T08:56:40.253

You don't really need kbordermatrix to obtain this layout. However, the matrix in the last column can't have an overbrace, so I added a \vphantom of a similar matrix.

I also propose a variant with inner medium-sized matrices, with the mmatrix environment from nccmath. Last, I had to load icomma to have a correct spacing of the decimal comma.

\documentclass[brazil]{article}
\usepackage{amssymb, array, mathtools}
\usepackage{icomma, nccmath} 
\newenvironment{bmmatrix}{\medsize\bmatrix}{\endbmatrix\endmedsize}

\begin{document}

\begin{align*}
\mathbf{A} & = \renewcommand{\arraystretch}{1.5}
 \begin{pmatrix}
            \,\smash[t]{\overbrace{\begin{bmatrix}
            0{,}9960 & -0,0037 \\
            0,0111 & 0,9867
            \end{bmatrix}}}
 &\negthickspace{,}\negthickspace\! & 
            \smash[t]{\overbrace{\begin{bmatrix}
            0,9961 & -0,0059 \\
            0,0715 & 1,0423
            \end{bmatrix}}}
 &\negthickspace{,}\negthickspace\! & 
            {\smash[t]{\overbrace%
            {\begin{bmatrix}
            1,0034 & 0,0009 \\
            0,0098 & 0,9696
            \end{bmatrix}}}}\, \vphantom{\begin{bmatrix}\, \\ \,
  \end{bmatrix}}
 \end{pmatrix}\\[2ex]\ 
\mathbf{A} & = \renewcommand{\arraystretch}{1.5}
\begin{pmatrix}
            \,\smash[t]{\overbrace{\begin{bmmatrix}
            0{,}9960 & -0,0037 \\
            0,0111 & 0,9867
            \end{bmmatrix}}}
 &\negthickspace{,}\negthickspace\! &
            \smash[t]{\overbrace{\begin{bmmatrix}
            0,9961 & -0,0059 \\
            0,0715 & 1,0423
            \end{bmmatrix}}}
 &\negthickspace{,}\negthickspace\! &
            {\smash[t]{\overbrace%
            {\begin{bmmatrix}
            1,0034 & 0,0009 \\
            0,0098 & 0,9696
            \end{bmmatrix}}}}\, \vphantom{\begin{bmmatrix}\, \\ \,
  \end{bmmatrix}}
 \end{pmatrix}
 \end{align*}

\end{document}

I really wanted to work with kbordermatrix, but your solution is interesting. I did not understand why you used the negthickspace and the smash commands. — Adriano, Apr 14 '19 at 03:24
The negthickspace is just for æsthetic reasons – so it's only a matter of personal taste. As to \smash[t], it is to ensure the three braces are above the external parentheses. — Bernard, Apr 14 '19 at 08:54
You should compensate the \smash with a \vphantom, or the braces would not be taken into consideration for vertical spacing. — egreg, Apr 14 '19 at 09:20
@egreg: That's right, but I have no context. If it's a new line in a multiline equation, a simple \\[2ex], for instance, might do the trick. — Bernard, Apr 14 '19 at 09:24

score 1 · Answer 3 · answered Apr 14 '19 at 09:48

My opinion is that kbordermatrix is the wrong tool for the job.

I suggest using siunitx for numeric tables.

Here the trick is to use a phantom two-line array in order to set the left and right delimiters. The definitions are made inside \[...\], so they are local to it.

If you have an alignment, the local definitions should be arranged differently, but it depends on what you're trying to achieve.

In any case, never use eqnarray (see eqnarray vs align).

\documentclass{article}
\usepackage{amsfonts,amssymb,array,mathtools}
\usepackage{siunitx}

\usepackage{lipsum} % for context

\sisetup{output-decimal-marker={,}}

\newcolumntype{T}[1]{S[table-format=#1]}
\newenvironment{nmatrix}[1]
 {\begin{bmatrix}\begin{tabular}{@{}#1@{}}}
 {\end{tabular}\end{bmatrix}}

\begin{document}

\lipsum*[3]
\[
\renewcommand{\tabcolsep}{2.5pt}
\renewcommand{\arraystretch}{1.2}
\newcommand{\LEFT}{%
  \left(\vphantom{\begin{bmatrix}1\\1\end{bmatrix}}\right.
}
\newcommand{\RIGHT}{%
  \left.\vphantom{\begin{bmatrix}1\\1\end{bmatrix}}\right)
}
%% Now the real job
\mathbf{A}=
\LEFT
\overbrace{
  \begin{nmatrix}{T{1.4}T{-1.4}}
  0,9960 & -0,0037    \\
  0,0111 &  0,9867        
  \end{nmatrix}
}\;,\;
\overbrace{
  \begin{nmatrix}{T{1.4}T{-1.4}}
  0,9961 & -0,0059    \\
  0,0715 &  1,0423
  \end{nmatrix}
}\;,\;
\overbrace{
  \begin{nmatrix}{T{1.4}T{1.4}}
  1,0034 & 0,0009     \\
  0,0098 & 0,9696
  \end{nmatrix}
}
\RIGHT
\]
\lipsum[3]

\end{document}

I really would like to use the kbordermatrix, because this package has the left and upper sides options to use as explainations of lines and columns. I know bordermatrix, but I read in kborderdermatrix documentation that kbordermatrix is an improvement version to bordermatrix. Is there any alternative as simmilar as kbordermatrix? — Adriano, Apr 15 '19 at 19:33

How to stretch delimiters to envolve matrices inside of a kbordermatrix?

3 Answers3