v2.4.0

New Features

• Complex Exponential (exp)
• Complex Exponentiation (pow)
• Zipf's Law Discrete Distribution
• Generalized harmonic non-integer sequence

Improvements

• Fixed Complex polarForm to compute the right values
• Fixed hyperharnomic non-integer sequence. Previously was computing the wrong thing
• Fixed how ArbitraryInterger handles pow of negative exponents

Backwards Incompatible Changes

• Complex polarForm now returns an array rather than a Complex number, as the Complex return was incorrect
• Interface to hyperharmonic non-integer sequence changed due to previous implementation being incorrect

v2.3.0

New Features

• Matrix SVD (Singular Value Decomposition)
• Polynomial companion matrix

v2.2.0

New Features

• PLS (Partial Least Squares Regression)

Improvements

• Add custom __debugInfo to NumericMatrix

v2.1.0

New Features

• Quaternion

v2.0.0

New Features

• Matrix Improvements
  • walk method to map a function to all values without mutation or returning a value
  • MatrixFactory creates more matrix types
  • MatrixFactory::createNumeric to create NumericMatrix types
  • MatrixFactory::createFromRowVector
  • MatrixFactory::createFromColumnVector
  • Internal ObjectMatrix improvements
    • Add trace
    • Add scalarMultiply
  • Add initial ComplexMatrix
• Sample data People

Improvements

• Bug fixes
  • Issue 414 fixed - PCA/Eigenvalue convergence
  • Issue 413 fixed - matrix solve with singular matrix using RREF

Migration - Upgrading to v2.0 from v1.0

• PHP minimum version now 7.2 (was 7.0)
• Deprecated code removed (backwards-incompatible change)
  • MathPHP\Statistics\Distance::kullbackLeiblerDivergence removed (Use MathPHP\Statistics\Divergence::kullbackLeibler instead)
  • MathPHP\Statistics\Distance::jensenShannonDivergence removed (Use MathPHP\Statistics\Divergence::jensenShannon instead)
  • Matrix Decompositions no longer implement \ArrayAccess interface to access decomposition matrixes. Use properties instead.
    • MathPHP\LinearAlgebra\Decomposition\Cholesky
      • $cholesky['L'], $cholesky['Lᵀ'], $cholesky['LT'] removed, use $cholesky->L, $cholesky->Lᵀ, $cholesky->LT instead.
    • MathPHP\LinearAlgebra\Decomposition\Crout
      • $crout['L'], $crout['U'] removed, use $crout->L, $crout->U instead.
    • MathPHP\LinearAlgebra\Decomposition\LU
      • $LU['L'], LU['U'], LU['P'] removed, use $LU->L, $LU->U, $LU->P instead.
    • MathPHP\LinearAlgebra\Decomposition\QR
      • $QR['Q'], $QR['R'] removed, use $QR->Q, $QR->R instead.
• Methods renamed (backwards-incompatible change)
  • MathPHP\Statistics\Distance::bhattacharyyaDistance renamed to MathPHP\Statistics\Distance::bhattacharyya
  • MathPHP\Statistics\Distance::hellingerDistance renamed to MathPHP\Statistics\Distance::hellinger
• Moved Functionality (backwards-incompatible change)
  • MathPHP\Functions\Polynomial moved to MathPHP\Expression\Polynomial
  • MathPHP\Functions\Piecewise moved to MathPHP\Expression\Piecewise
• Matrix internal refactoring
  • Note: These changes will not affect any client code as long as matrices were created using MatrixFactory.
  • Matrix is not a base abstract class for all matrix classes to extend
  • Matrix renamed NumericMatrix
  • Matrix base method createZeroValue
    • Use case is various ObjectMatrix classes that implement ObjectArithmetic
  • RowVector removed. Use MatrixFactory::createFromRowVector instead
  • ColumnVector removed. Use MatrixFactory::createFromColumnVector instead

v1.11.0

Improvements

• Bugfix (Issue 413): Matrix solve with singular matrix using RREF
• Bugfix (Issue 414): PCA/Eigenvalue convergence

v1.10.0

Improvements

• Bugfix (Issue 356): Fix Finance IRR NANs

v1.9.0

New Features

• Vector min and max
• Arithmetic isqrt (integer square root)

Improvements

• Remove Travis CI (Moved CI to Github Actions in v1.8.0 release)
• Rearrange non-code files

v1.8.0

Improvements

• Improve permutations algorithm to be more efficient and more numerically stable
• Qualify PHP function names with root namespace
• Move CI to Github Actions

v1.7.0

New Features

• Algebra linear equation of one variable
• Rational number inverse
• Rational number pow

Improvements

• Improve combinations algorithm to be more efficient and more numerically stable
• Internal Matrix class reorganization