accurpy 0.1.5

Ultra-accurate and fast double-double FM_new approximation with ≤1 ULP guarantees

accurpy

Ultra-accurate and fast double-double (106-bit) approximation for the new FM function. The C extension ships a single FMA-enabled pipeline validated to stay within 1 ULP versus high-precision references, and a pure-Python double-double fallback is provided when the extension is unavailable.

Install

pip install accurpy

Usage

import numpy as np
from accurpy import syncF

y = syncF(10.0, skip_exp=False)

x = np.geomspace(1e-12, 300.0, 1_000_000)
y_vec = syncF(x, skip_exp=True)

Notes

• Scalar calls and NumPy arrays both dispatch to the fast C implementation when available.
• When the extension cannot be imported, the package falls back to the same algorithm implemented in pure Python double-double arithmetic (slower, but numerically identical).

License

MIT