[Numpy-discussion] matrix norm

Jason Grout jason-sage at creativetrax.com
Mon Oct 22 11:44:25 EDT 2012

I'm curious why scipy/numpy defaults to calculating the Frobenius norm 
for matrices [1], when Matlab, Octave, and Mathematica all default to 
calculating the induced 2-norm [2].  Is it solely because the Frobenius 
norm is easier to calculate, or is there some other good mathematical 
reason for doing things differently?





* Matlab (http://www.mathworks.com/help/matlab/ref/norm.html).
* Octave (http://www.network-theory.co.uk/docs/octave3/octave_198.html).
* Mathematica (http://reference.wolfram.com/mathematica/ref/Norm.html)

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