http://mathworld.wolfram.com/L1-Norm.html
http://mathworld.wolfram.com/L2-Norm.html
matlab : https://www.mathworks.com/matlabcentral/answers/146264-how-to-perform-l2-normalization
If v is the vector do:
v = v/norm(v);
(The 'norm' function gives L2 norm as a default.)
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