matrices

• Row matrix


  [ a b c d ]
• Column matrix

  [ a ]

  b

  c

  d
• Square matrix 


  no of rows = no of columns
• Diagonal matrix 


  elements present diagonally rest null
• Scalar matrix 


  diagonal elements equal

  
• Identity matrix

  diagonal matrix where diagonal elements are 1

  
• Zero matrix


  all elements are zero

  
• Equality of matrices

  Matrices are considered equal if all their corresponding elements are equal
• Order of matrix

  No of rows x no of columns
• Transpose of a matrix

  Matrix obtained by interchanging rows and columns of matrix
• (AB)’=


  B’A’
• Symmetric matrix


  A square matrix A = [a,] is said to be symmetric if A' = A, that is, [a,] = [a,] for all possible values of i and.
• Skew symmetric mAtrix


  A square matrix A is said to be skew symmetric matrix if A =- A, that is a, = - a, for all possible values of i and j.