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| R2012a Documentation → MATLAB | |
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Y = sign(X)
Y = sign(X) returns an array Y the same size as X, where each element of Y is:
1 if the corresponding element of X is greater than zero
0 if the corresponding element of X equals zero
-1 if the corresponding element of X is less than zero
For nonzero complex X, sign(X) = X./abs(X).
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