MATLAB norm
The norm function calculates a norm.
Contents
Usage
Vectors
When operating on vectors, the norm function calculates a 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 singular value