91Ó°ÊÓ

A matrix is a rectangular array of variables or constants in horizontal rows and vertical columns, usually enclosed in brackets. Data is organized in such a way that each position has a purpose. Each value of the matrix is called an element.

Represent the data for deaths due to hurricanes and lightning for each year 1996 to 2000.

$\begin{array}{l}\text{Lightning}\\ X=\begin{array}{c}1996\\ 1997\\ 1998\\ 1999\\ 2000\end{array}\left[\begin{array}{c}52\\ 42\\ 44\\ 46\\ 51\end{array}\right]\end{array}$ and,

$\begin{array}{l}\text{Hurricanes}\\ Y=\begin{array}{c}1996\\ 1997\\ 1998\\ 1999\\ 2000\end{array}\left[\begin{array}{c}37\\ 1\\ 9\\ 19\\ 0\end{array}\right]\end{array}$

In order to find how many more people died as a result of lightning than hurricanes for each year subtract matrix Y from matrix X and simplify.

$\begin{array}{c}\text{LightningHurricanes}\\ X−Y=\begin{array}{c}1996\\ 1997\\ 1998\\ 1999\\ 2000\end{array}\left[\begin{array}{c}52\\ 42\\ 44\\ 46\\ 51\end{array}\right]\text{ â¶Ä‰â¶Ä‰â¶Ä‰}−\text{ â¶Ä‰â¶Ä‰â¶Ä‰}\left[\begin{array}{c}37\\ 1\\ 9\\ 19\\ 0\end{array}\right]\\ =\left[\begin{array}{c}52−37\\ 42−1\\ 44−9\\ 46−19\\ 51−0\end{array}\right]\\ =\left[\begin{array}{c}15\\ 41\\ 35\\ 27\\ 51\end{array}\right]\end{array}$

Therefore, the obtained column matrix represents the difference in the deaths due to lightning and hurricanes.