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Author: Bartolomeo Stellato, Paul Goulart, Goran Banjac

Classifiers

qdldl-python

Python interface to the QDLDL free LDL factorization routine for quasi-definite linear systems: Ax = b.

Installation

This package can be directly installed via pip,

pip install qdldl

Usage

Initialize the factorization with

import qdldl
F = qdldl.Solver(A)

where A must be a square quasi-definite matrix in scipy sparse CSC format.

The algorithm internally converts the matrix into upper triangular format. If A is already upper-triangular, you can specify it with the argument upper=True to the qdldl.Solver constructor.

To solve the linear system for a right-hand side b, just write

x = F.solve(b)

To update the factorization without changing the sparsity pattern of A you can run

F.update(A_new)

where A_new is a sparse matrix in CSR format with the same sparsity pattern as A.

The algorithm internally converts A_new into upper triangular format. If A_new is already upper-triangular, you can specify it with the argument upper=True to the F.update function.

0.1.9.post1 Feb 19, 2026

0.1.7.post5 Jan 02, 2025

0.1.7.post4 Jun 22, 2024

0.1.7.post3 Jun 17, 2024

0.1.7.post2 Apr 18, 2024

0.1.7.post1 Apr 05, 2024

0.1.7.post0 Jul 05, 2023

0.1.7 Apr 05, 2023

0.1.5.post3 Jan 15, 2023

0.1.5.post2 Mar 31, 2022

0.1.5.post0 Jan 06, 2021

0.1.5 Jan 04, 2021

0.1.3 Jun 10, 2020

0.1.2 Jun 10, 2020

0.1.1 May 12, 2020

0.1.0 Mar 21, 2020

0.0.1 Jan 04, 2020

Wheel compatibility matrix

Platform	CPython 3.8	CPython 3.9	CPython 3.10	CPython 3.11	CPython 3.12	CPython 3.13	CPython 3.14	CPython (additional flags: t) 3.13	CPython (additional flags: t) 3.14
macosx_10_13_x86_64
macosx_10_15_x86_64
macosx_10_9_x86_64
macosx_11_0_arm64
manylinux_2_24_aarch64
manylinux_2_24_x86_64
manylinux_2_28_aarch64
manylinux_2_28_x86_64
win_amd64
win_arm64

Files in release

qdldl-0.1.9.post1-cp310-cp310-macosx_10_9_x86_64.whl (116.6KiB)

qdldl-0.1.9.post1-cp310-cp310-macosx_11_0_arm64.whl (112.4KiB)

qdldl-0.1.9.post1-cp310-cp310-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl (1.3MiB)

qdldl-0.1.9.post1-cp310-cp310-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (1.4MiB)

qdldl-0.1.9.post1-cp310-cp310-win_amd64.whl (99.8KiB)

qdldl-0.1.9.post1-cp311-cp311-macosx_10_9_x86_64.whl (117.9KiB)

qdldl-0.1.9.post1-cp311-cp311-macosx_11_0_arm64.whl (113.8KiB)

qdldl-0.1.9.post1-cp311-cp311-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl (1.4MiB)

qdldl-0.1.9.post1-cp311-cp311-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (1.4MiB)

qdldl-0.1.9.post1-cp311-cp311-win_amd64.whl (100.3KiB)

qdldl-0.1.9.post1-cp311-cp311-win_arm64.whl (96.7KiB)

qdldl-0.1.9.post1-cp312-cp312-macosx_10_13_x86_64.whl (119.6KiB)

qdldl-0.1.9.post1-cp312-cp312-macosx_11_0_arm64.whl (114.9KiB)

qdldl-0.1.9.post1-cp312-cp312-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl (1.4MiB)

qdldl-0.1.9.post1-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (1.4MiB)

qdldl-0.1.9.post1-cp312-cp312-win_amd64.whl (102.1KiB)

qdldl-0.1.9.post1-cp312-cp312-win_arm64.whl (96.6KiB)

qdldl-0.1.9.post1-cp313-cp313-macosx_10_13_x86_64.whl (119.6KiB)

qdldl-0.1.9.post1-cp313-cp313-macosx_11_0_arm64.whl (115.0KiB)

qdldl-0.1.9.post1-cp313-cp313-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl (1.4MiB)

qdldl-0.1.9.post1-cp313-cp313-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (1.4MiB)

qdldl-0.1.9.post1-cp313-cp313-win_amd64.whl (102.1KiB)

qdldl-0.1.9.post1-cp313-cp313-win_arm64.whl (96.6KiB)

qdldl-0.1.9.post1-cp313-cp313t-macosx_10_13_x86_64.whl (126.3KiB)

qdldl-0.1.9.post1-cp313-cp313t-macosx_11_0_arm64.whl (121.3KiB)

qdldl-0.1.9.post1-cp313-cp313t-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl (1.4MiB)

qdldl-0.1.9.post1-cp313-cp313t-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (1.4MiB)

qdldl-0.1.9.post1-cp313-cp313t-win_amd64.whl (111.0KiB)

qdldl-0.1.9.post1-cp313-cp313t-win_arm64.whl (101.9KiB)

qdldl-0.1.9.post1-cp314-cp314-macosx_10_15_x86_64.whl (119.9KiB)

qdldl-0.1.9.post1-cp314-cp314-macosx_11_0_arm64.whl (115.2KiB)

qdldl-0.1.9.post1-cp314-cp314-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl (1.4MiB)

qdldl-0.1.9.post1-cp314-cp314-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (1.4MiB)

qdldl-0.1.9.post1-cp314-cp314-win_amd64.whl (105.2KiB)

qdldl-0.1.9.post1-cp314-cp314-win_arm64.whl (100.1KiB)

qdldl-0.1.9.post1-cp314-cp314t-macosx_10_15_x86_64.whl (126.5KiB)

qdldl-0.1.9.post1-cp314-cp314t-macosx_11_0_arm64.whl (121.3KiB)

qdldl-0.1.9.post1-cp314-cp314t-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl (1.4MiB)

qdldl-0.1.9.post1-cp314-cp314t-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (1.4MiB)

qdldl-0.1.9.post1-cp314-cp314t-win_amd64.whl (114.8KiB)

qdldl-0.1.9.post1-cp314-cp314t-win_arm64.whl (105.3KiB)

qdldl-0.1.9.post1-cp38-cp38-macosx_10_9_x86_64.whl (116.1KiB)

qdldl-0.1.9.post1-cp38-cp38-macosx_11_0_arm64.whl (112.1KiB)

qdldl-0.1.9.post1-cp38-cp38-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl (1.3MiB)

qdldl-0.1.9.post1-cp38-cp38-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (1.4MiB)

qdldl-0.1.9.post1-cp38-cp38-win_amd64.whl (99.5KiB)

qdldl-0.1.9.post1-cp39-cp39-macosx_10_9_x86_64.whl (116.7KiB)

qdldl-0.1.9.post1-cp39-cp39-macosx_11_0_arm64.whl (112.6KiB)

qdldl-0.1.9.post1-cp39-cp39-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl (1.3MiB)

qdldl-0.1.9.post1-cp39-cp39-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl (1.4MiB)

qdldl-0.1.9.post1-cp39-cp39-win_amd64.whl (99.9KiB)

qdldl-0.1.9.post1.tar.gz (74.5KiB)

Extras: None

Dependencies:

scipy (>=0.13.2)