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Version 4.3.0 - 2025-11-11

  • Add net10.0 and remove net6.0 target framework.
  • Minor optimizations for matrix-vector multiplication.
  • Minor optimizations checking empty Span.

Version 4.2.0 - 2024-09-15

  • Make SymbolicColumnStorage class public and update StronglyConnectedComponents and DulmageMendelsohn decomposition accordingly.

Version 4.1.0 - 2024-06-14

  • Add overload for creating a sparse matrix from an enumerable of ValueTuple.
  • Add matrix EnumerateIndexedAsValueTuples() to enumerate entries as ValueTuple.

Version 4.0.0 - 2024-04-03

The major version change is due to the removal of obsolete methods in the Converter class. Visibility of that class was changed from public to internal. In case those obsolete methods were still used, please switch to the static conversion methods provided by the SparseMatrix class.

Additional changes:

  • Add helper method Helper.ValidateStorage(...) to validate the structure of a sparse matrix.
  • Update to GetHashCode() method of CompressedColumnStorage class.
  • Improvements to documentation.

Version 3.8.1 - 2023-11-15

  • Add overloads for permutation Invert() and IsValid() methods taking the permutation length as argument.

Version 3.8.0 - 2023-05-20

  • Add overloads for the factorization Solve() methods taking Span<T> as argument. Note that this introduces a dependency on System.Memory for the netstandard2.0 assembly.

Version 3.7.0 - 2022-05-04

  • Add sparse matrix OfDiagonals static method (similar to MATLAB spdiags).

Version 3.6.0 - 2021-11-25

  • Remove .NET 4.5 target framework, upgrade .NET 5.0 to 6.0.
  • Add constructor that takes explicit non-zeros count to CoordinateStorage class.

Version 3.5.0 - 2021-01-14

  • Remove .NET 4.0 target framework, add .NET 5.0.

Version 3.4.9 - 2020-11-06

  • Add CoordinateStorage constructor that uses existing storage arrays.
  • Convert CoordinateStorage to sparse matrix in place.

Version 3.4.7 - 2020-08-28

  • BREAKING: make SparseLDL constructor private (use static create methods instead).
  • Add complex version of SparseLDL.
  • Add matrix.EnumerateIndexed(action) overload.

Version 3.4.6 - 2020-07-21

  • Add SolveTranspose method for SparseQR.

Version 3.4.5 - 2020-06-11

This release introduces the static SparseMatrix.AutoTrimStorage option, which enables control over hidden memory allocations in matrix addition and multiplication. By default, the matrix storage will be resized to exactly fit the non-zeros count, which involves new memory allocations. If you want to avoid this, set AutoTrimStorage to false.

Additional changes:

  • Add public helper methods Helper.TrimStrorage(...) and Helper.SortIndices(...)
  • Add DenseMatrix.OfJaggedArray(...)

Version 3.4.3 - 2020-05-25

  • Add a sparse matrix multiplication overload that accepts the result matrix as a parameter.

Version 3.4.2 - 2020-05-13

  • Make CSparse.NET CLS compliant
  • Mark public methods of Converter class as obsolete

Version 3.4.1 - 2019-10-02

  • Improved validation of matrix constructor arguments
  • Fixes an issue with CoordinateStorage throwing IndexOutOfRangeException (introduced in v3.4.0)

Version 3.4.0 - 2019-09-15

  • Parallel dense and sparse matrix multiplication (by Andreas Girgensohn)
  • General performance improvements for sparse matrix addition and multiplication

Version 3.3.0 - 2019-04-29

  • Support more target frameworks (including netstandard2.0).
  • Public access to members of Dulmage-Mendelsohn decomposition.
  • Compute strongly connected components.

Version 3.2.3 - 2018-11-30

  • Added matrix creation helper (e.g. call SparseMatrix.OfIndexed(s) to convert coordinate storage).

Version 3.2.2 - 2018-10-12

  • Added MatrixMarket writer.
  • BREAKING: make IProgress interface compatible with .NET 4.5.

Version 3.2.1 - 2018-09-17

Version 3.2.0 - 2018-03-09

  • Added new DenseMatrix type.
  • BREAKING: removed deprecated CompressedColumnStorage type.
  • BREAKING: removed deprecated matrix.Norm(int) method.

Version 3.1.10 - 2018-03-06

  • Rename CompressedColumnStorage to SparseMatrix.
  • BREAKING: matrix.Multiply(x, y) overwrites y (instead of update).
  • BREAKING: sparse matrix PermuteColumns returns a new matrix (instead of update).

Version 3.1.9 - 2017-01-06

  • BREAKING: use static Create methods (e.g. SparseLU.Create(...)) instead of constructors.

Version 3.1.4 - 2015-09-19

  • Initial release of CSparse.NET (based on Tim Davis CSparse version 3.1.4)