[Numpy-discussion] Computing the norm of an array of vectors
Ben Gamari
bgamari.foss@gmail....
Tue Feb 8 10:44:42 CST 2011
I have an array of (say, row) vectors,
v = [ [ a1, a2, a3 ],
[ b1, b2, b3 ],
[ c1, c2, c3 ],
...
]
What is the optimal way to compute the norm of each vector,
norm(v)**2 = [
[ a1**2 + a2**2 + a3**2 ],
[ b1**2 + b2**2 + b3**2 ],
...
]
It seems clear that numpy.norm does not handle the multidimensional case
as needed. The best thing I can think of is to do something like,
sum(v**2, axis=0) * ones(3)
but surely there must be a better way. Any ideas?
Cheers,
- Ben
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