inf.norm: Compute the infinitity norm of a matrix

In matrixcalc: Collection of Functions for Matrix Calculations

Compute the infinitity norm of a matrix

Description

This function returns the ≤ft\| {\mathbf{x}} \right\|_∞ norm of the matrix {\mathbf{x}}.

Usage

inf.norm(x)

Arguments

x	a numeric vector or matrix

Details

Let {\bf{x}} be an m \times n numeric matrix. The formula used to compute the norm is ≤ft\| {\bf{x}} \right\|_∞ = \mathop {\max }\limits_{1 ≤ i ≤ m} ∑\limits_{j = 1}^n {≤ft| {x_{i,j} } \right|} . This is merely the maximum absolute row sum of the m \times n maxtris.

Value

A numeric value.

Author(s)

Frederick Novomestky [e-mail]

References

Bellman, R. (1987). Matrix Analysis, Second edition, Classics in Applied Mathematics, Society for Industrial and Applied Mathematics.

Golub, G. H. and C. F. Van Loan (1996). Matrix Computations, Third Edition, The John Hopkins University Press.

Horn, R. A. and C. R. Johnson (1985). Matrix Analysis, Cambridge University Press.

See Also

one.norm

Examples

A <- matrix( c( 3, 5, 7, 2, 6, 4, 0, 2, 8 ), nrow=3, ncol=3, byrow=TRUE )
print( inf.norm( A ) )

matrixcalc documentation built on Sept. 15, 2022, 1:05 a.m.