# Matrix : Types

 1. Row Matrix A matrix having only one row and n columns is called row matrix. i.e. [a11 a12 a13….. a1n]1xn For example [2 3 4 5]1×4 2. Column Matrix A matrix having only m rows and one column is called column matrix i.e. 3. Square Matrix A matrix order m x n called square matrix where m = n, i.e., it has same numbers of rows and columns. 4. Diagonal Matrix A square matrix having main diagonal elements non zero and other elements are zero is called diagonal matrix. 5. Scalar Matrix A diagonal matrix having each diagonal element equal is called scalar matrix. For i.e. 6. Unit (or Identify) Matrix A diagonal matrix having each diagonal element equal to one is called unit matrix. It denote by In. Thus, 7. Null (or Zero) Matrix A matrix of order m x n having all elements are zero is called Null matrix and it’s denoted by 0. i.e. 8. Upper Triangular Matrix A square is said to be an upper triangular matrix if all elements below the main diagonal are zero. As, 9. Lower Triangular Matrix A square matrix is said to be an lower triangular matrix if all elements above the main diagonal are zero. i.e.