Stable Numerics Subroutine Library
Programming Reference Manual
Version 1.1 DD-00006-011

7.2.11 Metrics and R  conversion

T width() const; 
T midpoint() const; 
T magnitude() const; 
T mignitude() const; 
T pivot() const; 
T size() const; 
T radius() const;

These functions convert the interval into a R  space representation. Given the current interval as A ∈ KR  these metrics are defined as:

width()


Width of the interval a-a- .

midpoint()


Midpoint of the interval 1(a+ a)
2.

magnitude()


Magnitude of the interval max(|a|,| a|)  .

mignitude()


Mignitude of the interval min(|a|,| a|)  .

pivot()


Pivot of the interval √︁max(-|a|,| a|)min(|a|,| a|)  .

size()


Size of the interval 1(|a-|+ |a|)
2.

radius()


Radius of the interval    (-         - )
max a-a-a,a-- a-a-
     2        2.