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C++ API

: sign (x)

Compute the signum function.

This is defined as

          -1, x < 0;
sign (x) =  0, x = 0;
           1, x > 0.

For complex arguments, sign returns x ./ abs (x).

Note that sign (-0.0) is 0. Although IEEE 754 floating point allows zero to be signed, 0.0 and -0.0 compare equal. If you must test whether zero is signed, use the signbit function.

See also: signbit.

Package: octave