Trouble spacing in array environment

arraysspacing

I have constructed the following table:

To do so, I used the following code:

begin{equation*}
    \begin{array}{c|ccc|c}
        & & & & \overline{b} \\ \hline
        x_5 & 1 & 0 & 0 & 0 \\
        x_6 & 0 & 1 & 0 & 0 \\
        x_7 & 0 & 0 & 1 & 1\\ \hline
        z & 0 & 0 & 0 & 0
    \end{array}     
    \hspace{2cm}
    \begin{array}{|c|}
    x_1 \\ \hline
    \fbox{$0.5$} \\
    0.5 \\ 
    1 \\ \hline 
    10
    \end{array}
\end{equation*}

But I really would like to add some further spacing in the tables, making it look bigger, i.e., make them look like this:

What change would I have to make to my code to get the result I want? Thanks for any help in advance!

UPDATE. I was able to extend my tables further horizantally using the command \arraycolsep = 12pt. How would one make the lines look darker like in the image I posted? The current state is the following:

Best Answer

You can locally change the value of \arraycolsep:

\documentclass{article}
\usepackage{amsmath,array}

\begin{document}

\begin{equation*}
  \setlength{\arraycolsep}{12pt}
  \newcommand{\FILLER}{\begin{matrix} 0 & 0 & 0 \end{matrix}}
  \begin{array}[t]{c|ccc|c}
  & & & & \bar{b} \\
  \hline
  x_5 & 1 & 0 & 0 & 0 \\
  x_6 & 0 & 1 & 0 & 0 \\
  x_7 & 0 & 0 & 1 & 1\\
  \hline
  z & 0 & 0 & 0 & 0 \\[-0.8\normalbaselineskip]
  & \multicolumn{3}{c|}{\underbrace{\hphantom{\FILLER}}_{w^1}} & \\
  \end{array}
  \qquad
  \setlength{\arraycolsep}{3pt}
  \begin{array}[t]{|ccc|}
  & x_1 & \\
  \hline
  & \multicolumn{1}{|c|}{0.5} & \\
  \cline{2-2}
  & 0.5 & \\ 
  & 1 & \\
  \hline 
  & 10 &
  \end{array}
\end{equation*}

\end{document}

For thicker lines, add something like

\setlength{\arrayrulewidth}{0.8pt}

to get

Related Solutions

[Tex/LaTex] Numbering an array as one single equation LaTeX

Using the eqnarray environment instead of array, you can add \nonumber to any lines you don't want numbered. If you don't do this, every line will be numbered.

\begin{eqnarray}
N_{x,sk} &=& k_{sk}\left(\frac{t_{sk}}{b_{sk}}\right)^{2}\bar{Et} \nonumber \\
N_{x,st} &=& k_{st}\left(\frac{t_{st}}{b_{st}}\right)^{2}\bar{Et}
\end{eqnarray}

(Just remove the \nonumber from the above to get the second example.)

[Tex/LaTex] cases and spacing between array rows

array increases the line spacing in a construct such as \\[2em] by adding 2em to its standard strut depth. However, your construction produces something that is deeper than the standard strut already, so the adjustment is not as much as you thought you requested. As you are using dcases which is in mathtools you could, or even should, use an align* environment instead, and that will space correctly.

Sample output

\documentclass{article}

\usepackage{mathtools}

\begin{document}

\verb+array+ example with large depth on lines has a problem:
\[
\begin{array}{l}
  f(x) = \vrule height 2em depth 2em \\[2em]
  g(x) = x \\[2em]
  k(x) = \vrule height 2em depth 2em
\end{array}
\]

The \verb+align*+ version of the original code spaces correctly.

\begin{align*}
  f(x) &=%
  \begin{dcases}
    -1 & x < 0 \\
    1 & x > 0
  \end{dcases} \\[2em]
  g(x) &= x \\[2em]
  k(x) &=%
  \begin{dcases}
    -1 & x < 0 \\
    1 & x > 0
  \end{dcases}
\end{align*}
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Numbering an array as one single equation LaTeX

[Tex/LaTex] cases and spacing between array rows

Related Question