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oj! Algorithms v47.2.0 Release Notes

Release Date: 2019-05-03 // about 5 years ago

  • 🔄 Changed

    org.ojalgo.data

    • 📇 Renamed DataPreprocessors to DataProcessors, and added methods to create a covariance matrix from an SVD.

    org.ojalgo.function

    • ➕ Added a couple more utilities to MissingMath

    org.ojalgo.matrix

    • 🆕 New LU decomposition implementation that is faster for small matrices.
    • 🛠 Fixed a bug related to solving equation systems and inverting matrices using SingularValue at certain matrix sizes.
    • 📇 Renamed checkAndCompute to checkAndDecompose in the MatrixDecomposition.Hermitian interface
    • Extended the MatrixStore.LogicalBuilder rows() and columns() methods to allow for negative indexes that refer to all zero rows/columns.
    • 🆕 New more efficient implementation of MatrixStore.LogicalBuilder.diagonal() data structure.
    • The MatrixDecomposition interface now extends Structure2D so that you can get the size/shape of the original matrix.
    • ➕ Additions to the MatrixDecomposition.RankRevealing interface. It is now possible to estimate the rank using a custom threshold. Also reworked all code related to estimating rank (in all implementations of that interface).

    org.ojalgo.netio

    • 🆕 New funcion to generate random strings of ASCII characters, of specified length.

    org.ojalgo.optimisation

    • The optimisation model parameter scaling functionality has been tweaked to be more in line with the improved "rank revealing" of matrices.
    • Minor improvements to ConvexSolver

    org.ojalgo.structure

    • The Stream2D interface now has methods operateOnColumns(...) and operateOnRows(...)