Graphics, Figures & Tables ⇒ multi-element framebox in array

[Sagil]

My problem is the following: I have an array, and want to put frame boxes around elements. For a single element that's simple, e.g.

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Code, edit and compile here:

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\begin{array}{ccc}
0 & \fbox{1} & 1 \\
1 & 0 & 0
\end{array}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Run LaTeX here

But how can you do this for multiple elements? E.g. put a box around the two adjacent '1's?

Thanks, Henning

[gmedina]

Hi Henning,

the hhline package could be helpful; take a look at the following example:

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Code, edit and compile here:

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\documentclass{article}
\usepackage{hhline}
\begin{document}
\[
  \begin{array}{ccc}
    \hhline{~--}0 & \multicolumn{1}{|c}{1} & \multicolumn{1}{c|}{1} \\
    \hhline{~--}1 &  0 & 0
  \end{array}
\]
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Run LaTeX here

Edit: the same result can be achieved without extra packages:

Code: Select all

Code, edit and compile here:

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\documentclass{article}
\begin{document}
\[
  \begin{array}{ccc}
    \cline{2-3}
    0 & \multicolumn{1}{|c}{1} & \multicolumn{1}{c|}{1} \\\cline{2-3}
    1 &  0 & 0
  \end{array}
\]
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Run LaTeX here

[Sagil]

Thanks, that's close but it doesn't look quite right - basically I want elements to appear as "grouped together". Consider e.g. the following code:

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Code, edit and compile here:

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\documentclass{article}
\usepackage{hhline}
\begin{document}
\newcommand{\lone}{\multicolumn{1}{|c}{1}}
\newcommand{\rone}{\multicolumn{1}{c|}{1}}
\newcommand{\lrone}{\multicolumn{1}{|c|}{1}}
\[
\left(
\begin{array}{cccccc}
\hhline{~~-~--}
0 & 0 & \lrone & 0 & \lone & \rone\\
\hhline{-~----}
\lrone & 0 & 0 & \lrone & 0 & \lrone\\
\hhline{-~----}
0 & 0 & \lrone & 0 & \lrone & 0\\
\hhline{~--~--}
0 & \lrone & 0 & 0 & 0 & \lrone\\
\hhline{~-~~~-}
\end{array}
\right)
\]
\[
\left(
\begin{array}{cccccc}
\hhline{~~~~--}
0 & 0 & \fbox{1} & 0 & \lone & \rone\\
\hhline{~~~~--}
\fbox{1} & 0 & 0 & \fbox{1} & 0 & \fbox{1}\\
0 & 0 & \fbox{1} & 0 & \fbox{1} & 0\\
0 & \fbox{1} & 0 & 0 & 0 & \fbox{1}\\
\end{array}
\right)
\]
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Run LaTeX here

This generates the following two matrices as output:

fboxmatrix.png (4.75 KiB) Viewed 4125 times

In the first one groupings are not very clear when '1's are close together, in the second one the box alignment is off. Any ideas?