Matrix Fundamentals
A matrix is a rectangular array of data.
In everyday language it is basically a "table." The only difference is the "cells" of the table are not seperated by lines, and the entire "table" is not enclose by lines, just brackets.
The numbers are known as elements.
Matrices (plural) are named using capital letters.
In this page, you will learn to determine dimensions and to identify elements of matrices. 


How to Determine the Dimensions 
The dimensions are listed as row x column, or n x m, where n represents the number of rows and m represents the number of columns. Be careful that you know the difference between a row and a column  and don't mix them up!
*Important Note: Rows go across, and columns go up and down.
Example #1: Look below to see how to write the dimensions of a matrix.
Make sure that you are careful not to write (4 x 2). The order matters! It must always be (row x column), not the other way around!
Example #2: Look at the additional examples below for practice.
Matrices are named with capital letters; there elements are named with lowercase letters and subscripts. The first number of the subscript is the row, and the second number is the column (again, think row x column).
Look at the image below to learn how to identify elements within matrices.
More Examples: 


Many operations can be performed with matrices: addition, subtraction, scalar multiplication, multiplication, inverses, and more.
Now that you know matrix fundamentals, you can move onto more interesting problems.
You may also want to return to GradeA's free algebra help or vist the homepage for other free math help resources..
