Description

The sign function returns the sign of an arithmetic type. If its argument is a complex number (Complex_Type), it returns the sign of the imaginary part of the number. If the argument is an array, a new array will be created whose elements are obtained from the original array by using the sign function.

When applied to a real number or an integer, the sign function returns -1, 0, or +1 according to whether the number is less than zero, equal to zero, or greater than zero, respectively.