Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is an older version of Boost and was released in 2013. The current version is 1.90.0.
The Sinus Cardinal
family of functions (indexed by the family of indices a
> 0) is defined by 
;
it sees heavy use in signal processing tasks.
By analogy, the Hyperbolic
Sinus Cardinal family of functions (also indexed by the family
of indices a > 0) is defined by 
.
These two families of functions are composed of entire functions.
These functions (sinc_pi and sinhc_pi) are needed by our implementation of quaternions and octonions.
Sinus Cardinal of index pi (purple) and Hyperbolic Sinus Cardinal of index pi (red) on R
