= MATLAB norm =

The '''`norm`''' function calculates a [[LinearAlgebra/Norm|norm]].

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== Usage ==


=== Vectors ===

When operating on vectors, the `norm` function calculates a [[LinearAlgebra/Norm|p-norm]].

To calculate a 2-norm, try:

{{{
norm([1 -2 3], 2)
}}}

As this suggests, the second argument is ''p''. If the second argument is not specified, 2 is assumed.



=== Matrices ===

When operating on matrices, the `norm` function dispatches between different norm calculations based on the second argument.

To calculate the Frobenius norm, try:

{{{
norm([1 2; 3 4], "fro")
}}}

Other valid values for the second argument are...
 * `Inf` for the maximum absolute row sum
 * `1` for the maximum absolute column sum
 * `2` (also the default) for the maximum [[LinearAlgebra/SingularValues|singular value]]



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