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sign returns a vector with the signs of the corresponding
elements of x (the sign of a real number is 1, 0, or $-1$
if the number is positive, zero, or negative, respectively). Note that sign does not operate on complex vectors.
sign(x)Math group generic.
abs
sign(pi) # == 1
sign(-2:3) # -1 -1 0 1 1 1
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