norm calculation using for loop

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g.p
g.p 2016-8-12
评论： KL 2017-10-16
hello , can anybody tell me how to calculate l2 norm of x=[2 3 -5 3 1] using for loop and without loop, and which one is efficient and fast?

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Adam
Adam 2016-8-12
n = norm( x );
does it without a loop. There is no reason to do it with a loop. Even if you don't use norm you would still vectorise is as:
n = sqrt( sum( x.^2 ) );
If you really want a loop the derivation is not difficult though. The vectorised version should certainly be faster, but you can test this yourself.
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Aash
Aash 2017-10-16
did u calculate it using for loops? how?
KL
KL 2017-10-16
As Adam has mentioned in his answer, loop is not necessary but if it's a homework and you must use a loop, then read the documentation to know how it works and then use the for loop iterator to index through the vector.
https://www.mathworks.com/help/matlab/matlab_prog/loop-control-statements.html

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