blokova matice

[Hans GINZEL]

Petr Kucera wrote:
>         Dnes mam nasledujici problem:
> Mam blokovou matici A, ktera ma bloky A_{11}, A_{12}, A_{21}, A_{22} a
> potrebuji, aby jednotlive bloky byly oddeleny teckovanou carou. Dale bych
> potreboval, aby to vypadalo priblizne nasledovne:
>
>           m'{[A_{11}:A_{12}]
>              [.............]
>         m-m'{[A_{21}:A_{22}]
>              \--v--/ \--v--/
>                 n'     n-n'
>
%Viz TeXBook str. 177
%bez slozenych zavorek.

$$\bordermatrix{&n&&n-n'\cr
   \hfill m\{&A_{11}&\vdots&A_{12}\cr
    &\ldots&\ldots&\ldots\cr
   m-m'\{&A_{21}&\vdots&A_{22}\cr}
$$

%Reseni v AMSTeXu se slozenymi zavorkami, ale nejsou hezke.
\newbox\tempbox
\setbox\tempbox=\hbox{\mathsurround 0pt $AA_{11}$}
$$\bordermatrix{&\underset\hbox to\wd\tempbox{\downbracefill}\to n&
      &\underset\hbox
to\wd\tempbox{\downbracefill}\to{\hphantom'n-n'}\cr
   \hfill m\big\{&AA_{11}&\vdots&AA_{12}\cr
                  &\ldots&\ldots&\ldots\cr
      m-m'\bigg\{&AA_{21}&\vdots&AA_{22}\cr}
$$
\bye Hans
        _
  ,~|  |/                    /~~~,                   ,
    | /|                    /       .               /
    |/ |/~/~~/  /~~/ \~~   |    _  / /~~/ ~~/ /~~/ /
   /| /| /  /_ /  / , \     \   / / /  /  /  /~~~ /
   ~  ~  ~~~  '  '  ~~~      ~~~|' '  ' '~~  ~~~ '
  Hans GINZEL                  /|   Room: B509
  Faculty of Mathematics      / /   Kolej 17. listopadu
    and Physics               ~~    Pa'tkova 3
  Charles University Prague         182 00 Praha 8
  E-mail: Hans at kolej.mff.cuni.cz    Tel.: ++42+2+8551040-49/761

 Dekuji Zdenku Wagnerovi za inspiraci.