This directory contains high-precision code for real-valued functions from libcerf.

The code can be used
- for verification of standard double-accuracy code,
- for generating reference values in tests, and
- for deriving coefficients in polynomial expansions.

For background, see
- Wuttke and Kleinsorge, "Algorithm 1062: Code generation for piecewise
  Chebyshev approximation", ACM Trans. Math. Softw. 52, 13 (2026),
  doi:10.1145/3805698
- software project ppapp, https://jugit.fz-juelich.de/mlz/app/ppapp,
  in particular userManual/userManual.pdf.

The C++ code in directory cpp has been used in a first development round.

Current coefficient tables have been generated using the Python code
in directory py. It is a verbatim copy of ppapp directory ppapp/demo_functions.
