signum

Sign of a number. The functions abs and signum should satisfy the law:

abs x * signum x == x

For real numbers, the signum is either -1 (negative), 0 (zero) or 1 (positive).

Scale a complex number to magnitude 1. For a complex number z, abs z is a number with the magnitude of z, but oriented in the positive real direction, whereas signum z has the phase of z, but unit magnitude.

Determine the 'sign' of a value.

The sign of a number.

>>> signum (-1)
-1

abs zero == zero, so any value for signum zero is ok. We choose lawful neutral:

>>> signum zero == zero
True

Takes the sign of a Quantity. The functions abs and signum satisy the law that:

abs x * signum x == x

The sign is either negate _1 (negative), _0 (zero), or _1 (positive).

Signum.

sign

Used to implement signum for the Num typeclass. This gives 1 for a positive integer, and -1 for a negative integer.

Example

>>> signumInteger 5
1

>>> signum 5
1

Return -1, 0, and 1 depending on whether argument is negative, zero, or positive, respectively

Apply signum to each element of the array

Op for signum

Bit-vector signum as an Integral.

signum over the Int type lifted over the Expr type.

> signum' xx'
signum x' :: Int

> evl (signum' minusTwo) :: Int
-1

signum over the Int type encoded as an Expr.

> signumE
signum :: Int -> Int

Construct and internalizing a SignumNumTerm.

Compute signum of a decimal, always one of 1, 0 or -1