Instance Property

ulp

The unit in the last place of this value.

Declaration

var ulp: Float { get }

Discussion

This is the unit of the least significant digit in this value’s significand. For most numbers x, this is the difference between x and the next greater (in magnitude) representable number. There are some edge cases to be aware of:

  • If x is not a finite number, then x.ulp is NaN.

  • If x is very small in magnitude, then x.ulp may be a subnormal number. If a type does not support subnormals, x.ulp may be rounded to zero.

  • greatestFiniteMagnitude.ulp is a finite number, even though the next greater representable value is infinity.

See also the ulpOfOne static property.

Relationships

From Protocol

See Also

Querying a Float

var significand: Float

The significand of the floating-point value.

var exponent: Int

The exponent of the floating-point value.

var nextUp: Float

The least representable value that compares greater than this value.

var nextDown: Float

The greatest representable value that compares less than this value.

var binade: Float

The floating-point value with the same sign and exponent as this value, but with a significand of 1.0.