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Absolute value and complex magnitude
Syntax
Y = abs(X)
Description
abs(X)
returns the absolute value, 
, for each element of X.
If X is complex, abs(X) returns the complex modulus (magnitude):
abs(X) = sqrt(real(X).^2 + imag(X).^2)
Examples
abs(-5) = 5 abs(3+4i) = 5
See Also
angle, sign, unwrap