Question

I have a 3 columns, n rows matrix:

[ a,b,c;
  d,e,f;
  g,h,i; ]

I want to apply the norm function to each of the rows, and get a 1xn matrix containing the norms:

[ norm([a,b,c]);
  norm([d,e,f]);
  norm([g,h,i]); ]

I could do this with a for-loop, but is there a better way?

Answer 1

What about

 norms = sqrt(sum(A.^2,1))

or

 norms = sqrt(sum(A.^2,2))?

depending on whether your coordinates are in rows or in columns.