what is the equivalent matlab function for the operator || || ?

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mari pavithra
mari pavithra 2015-3-14
编辑： Andrew Newell 2015-3-14
I am having an expression r=||x-Ab|| which I have to convert it into a matlab code.But i have no idea what is this || || operator.can anyone tell me what does it mean and what is the equivalent matlab fuction for it.
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Geoff Hayes
Geoff Hayes 2015-3-14
mari - please provide some context for this operator. What does it mean to you? What goes between the two pairs of vertical bars?

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Andrew Newell
Andrew Newell 2015-3-14
编辑：Andrew Newell 2015-3-14
You're probably referring to the matrix norm, which is a generalization of the idea of "distance". The equivalent MATLAB function is norm. If there is no subscript on your operator symbol, it probably represents the 2-norm, which is the default for the MATLAB function. For your example, you could write
r = norm(x-A*b);
See also Operator norm.

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