Numpy-QuadDType

Installation

pip install numpy==2.1.0
pip install -i https://test.pypi.org/simple/ quaddtype

Usage

import numpy as np
from numpy_quaddtype import QuadPrecDType, QuadPrecision

# using sleef backend (default)
np.array([1,2,3], dtype=QuadPrecDType())
np.array([1,2,3], dtype=QuadPrecDType("sleef"))

# using longdouble backend
np.array([1,2,3], dtype=QuadPrecDType("longdouble"))

Install from source

The code needs the quad precision pieces of the sleef library, which is not available on most systems by default, so we have to generate that first. The below assumes one has the required pieces to build sleef (cmake and libmpfr-dev), and that one is in the package directory locally.

git clone https://github.com/shibatch/sleef.git
cd sleef
cmake -S . -B build -DSLEEF_BUILD_QUAD:BOOL=ON -DSLEEF_BUILD_SHARED_LIBS:BOOL=ON -DCMAKE_POSITION_INDEPENDENT_CODE=ON
cmake --build build/ --clean-first -j
cd ..

In principle, one can now install this system-wide, but easier would seem to use the version that was just created, as follows:

export SLEEF_DIR=$PWD/sleef/build
export LIBRARY_PATH=$SLEEF_DIR/lib
export C_INCLUDE_PATH=$SLEEF_DIR/include
export CPLUS_INCLUDE_PATH=$SLEEF_DIR/include
python3 -m venv temp
source temp/bin/activate
pip install meson-python numpy pytest
pip install -e . -v --no-build-isolation
export LD_LIBRARY_PATH=$SLEEF_DIR/lib

Here, we created an editable install on purpose, so one can just work from the package directory if needed, e.g., to run the tests with,

python -m pytest

Uh oh!