What is norm 2 function ?

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ANJU
ANJU 2014-4-20
评论： Youssef Khmou 2014-4-21
Sir..can i use norm 2 function for image matching based on the image features ??

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Walter Roberson
Walter Roberson 2014-4-20
http://www.mathworks.com/help/matlab/ref/norm.html
n = norm(X) returns the 2-norm of input X and is equivalent to norm(X,2). If X is a vector, this is equal to the Euclidean distance. If X is a matrix, this is equal to the largest singular value of X.

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Youssef Khmou
Youssef Khmou 2014-4-20
norm(X,2) returns the largest singular value, in your case , i propose that you test with the three existing norms : Forbenius, Inf, 2 and the norm 1 which is the largest column sum.
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Walter Roberson
Walter Roberson 2014-4-21
norm(X,2) would only return largest singular value if X was a matrix. If X is a vector it returns the Euclidean length of the vector.
Youssef Khmou
Youssef Khmou 2014-4-21
thnks for the detail.

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