Library for double-double arithmetic calculation
Extension module for numpy providing the ddouble data type.
Loading this module registers an additional scalar data type ddouble with
numpy implementing double-double arithmetic. You can use use the data type
by passing dtype=xprec.ddouble to numpy functions.
The xprec.linalg module provides some linear algebra subroutines, in
particular QR, RRQR, SVD and truncated SVD.
Installation
$ pip install xprec
Quickstart
import numpy as np
x = np.linspace(0, np.pi)
# import double-double precision data type
from xprec import ddouble
x = x.astype(ddouble)
y = x * x + 1
z = np.sin(x)
# do some linalg
import xprec.linalg
A = np.vander(np.linspace(-1, 1, 80, dtype=ddouble), 150)
U, s, VT = xprec.linalg.svd(A)
Licence
The xprec library is Copyright (C) 2021 Markus Wallerberger. Licensed under the MIT license (see LICENSE.txt).
Contains code from the QD library, which is Copyright (C) 2012 Yozo Hida, Xiaoye S. Li, David H. Bailey. Released under the BSD license.