<< nextpow2

Elementary functions

normest >>

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norm

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Matrix and vector norms

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Syntax

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R = norm(V)

R = norm(V, p)

R = norm(V, 'fro')

R = norm(M)

R = norm(M, 1)

R = norm(M, 2)

R = norm(M, Inf)

R = norm(M, 'fro')

Input argument

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M

a 2D matrix single or double

V

a vector single or double

p

a scalar (p-norm)

Output argument

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R

result of norm: scalar.

Description

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norm computes the norm of a vector or a matrix.

Frobenius norm of M is equal to sqrt (sum (diag (M' * M))) .

Examples

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M = [1 2; 3 4];
norm(M)
norm(M, 1)
norm(M, 2)
norm(M, Inf)
norm(M, 'fro')
V = [1 2 3 4];
norm(V)
norm(V, 1)
norm(V, 2)
norm(V, Inf)
norm(V, 'fro')

x = ones(3000, 3000);
tic();R = norm(x);toc

See also

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svd.

History

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Version	Description
1.0.0	initial version

Author

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Allan CORNET