[Numpy-discussion] matrix norm

Inati, Souheil (NIH/NIMH) [E] souheil.inati@nih....
Mon Oct 22 11:20:11 CDT 2012


matlab default is the 2-norm.
norm(X) is equivalent to norm(X,2)
norm(X,'fro') is the frobenius norm.
There are others and some special cases for vectors.

http://www.mathworks.com/help/matlab/ref/norm.html


On Oct 22, 2012, at 12:14 PM, Jason Grout wrote:

> On 10/22/12 11:08 AM, Charles R Harris wrote:
> 
>> 
>> The 2-norm and the Frobenius norm are the same thing.
> 
> For vectors, but I was talking about matrices and induced p-norms (sorry 
> for not being clear).  Warren pointed out that the spectral norm (the 
> induced 2-norm) is used in Octave as the default.  Does someone have 
> matlab to test their implementation?  The fact that matlab has a 
> separate command for the Frobenius norm indicates that they also may be 
> using the spectral norm for the default matrix norm.
> 
> Thanks,
> 
> Jason
> 
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