MATLAB: What is norm 2 function

norm

Sir..can i use norm 2 function for image matching based on the image features ??

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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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MATLAB: Norm square

Is Pu a vector resulting from multiplying a vector by a matrix

P = randn(2,2);
u = randn(2,1);
norm(P*u,2)

MATLAB: What does the function ‘norm’ do

norm

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.
The 2-norm is equal to the Euclidean length of the vector.

So it norm(x) is norm(x,2) is sqrt(sum(x.^2))

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