Finite element method can be viewed as a means of forming matrix equation that approximates behaviour of a physical system. Hence, any finite element application results in forming, manipulating and solving matrix equations. Therefore, matrix algebra pertaining to finite element analysis is reviewed here.
A matrix is an m × n array of numbers arranged in m rows and n columns.
Size of [a] = m × n
aij→element of [a] corresponding to i th row and j th column.
1. Column matrix (vector) – n = 1: