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How can I create a vector like this one?

two-column vector

It is similar to this question, but with additional columns.

Community
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alex
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  • 10

1 Answers1

4

Quick and dirty approach with pmatrix environment

The individual columns are separated by a & character, the next linebreak is achieved with \\

If one replaces pmatrix with bmatrix, the [ ] version is obtained 

\documentclass[12pt]{article}

\usepackage{mathtools}

\begin{document}

\begin{equation*}
 A =  \begin{pmatrix}
   3 & 5 \\
   5 & 2 \\
   2 & 1 \\
   1 & 4 \\
   7 & 9 
   \end{pmatrix}
\end{equation*}

\end{document}

enter image description here

egreg
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  • Why not \\ instead of \cr? – Manuel Oct 08 '14 at 16:51
  • @Manuel: I always used \cr ;-) If it works with \\ too, the better ;-) –  Oct 08 '14 at 16:51
  • clean enough for me ;-) – alex Oct 08 '14 at 16:54
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    @ChristianHupfer Can you tell me where in the LaTeX manual or the doc for amsmath there's a description of \cr? Possibly I didn't read them carefully enough. Out of joke: *DON'T* use \cr in LaTeX documents. – egreg Oct 08 '14 at 17:55
  • @egreg: It's perhaps some old style but I am sure that I have seen it (not in a manual, though) with the \cr way ;-) –  Oct 08 '14 at 18:01
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    @ChristianHupfer It's not “old style”: it's wrong. You may have seen \matrix{1 & 2\cr 3 & 4\cr} using the LaTeX command inherited from Plain, that's supplanted by matrix of amsmath (and the other environments adding parentheses). See http://tex.stackexchange.com/questions/57658/misplaced-alignment-tab-character-when-building-a-matrix – egreg Oct 08 '14 at 18:04
  • Why an align* environment? – Mico Oct 08 '14 at 18:42