Using TeX Notation 4

Matrices

A Matrix is a rectangular array of numbers arranged in rows and columns which can be used to organize numeric information. Matrices can be used to predict trends and outcomes in real situations - i.e. polling.

A Matrix

A matrix can be written and displayed like

In this case the matrix is constructed using the brackets before creating the array:

 $$ M = \left[\begin{array} a&b&1 \ c&d&2 \ e&f&3\end{array}\right] $$

The internal structure of the array is generated by the &, ampersand, and the double backslash.

You can also create a grid for the matrix.

A dashed line	A solid line	A mixed line
$$ M = \left[\begin{array}{c.c.c} a&b&1 \ \hdash c&d&2 \ \hdash e&f&3\end{array}\right] $$	c|c} a&b&1 \ \hline c&d&2 \ \hline e&f&3\end{array}\right] $$	c} a&b&1 \ \hline c&d&2 \ \hdash e&f&3\end{array}\right] $$

The command sequences here are the {c|c.c} and \hdash and \hline. The pipe, |, and the full stop determine the line type for the vertical line.

Matrices also respond to other TeX Notation commands such as size and colour.

Colour	Size
$$ \blue M = \left[\begin{array}{c.c.c} a&b&1 \ \hdash c&d&2 \ \hdash e&f&3\end{array}\right] $$	$$ \fs7 M = \left[\begin{array}{c.c.c} a&b&1 \ \hdash c&d&2 \ \hdash e&f&3\end{array}\right] $$	$$ \fs2 M = \left[\begin{array}{c.c.c} a&b&1 \ \hdash c&d&2 \ \hdash e&f&3\end{array}\right] $$