v0.26.0

New Features

• Initial Complex number class
• Complex number support to quadratic and cubic equations
• Initial Eigenvalue strategy class (2x2 and 3x3 matrices using root equations)
• Matrix
  • isLowerTriangular
  • isUpperTriangular
  • isTriangular
  • isDiagonal
• Beta function convenience method

Improvements

• Add BadDataException to LeastSquares regression method trait if degrees of freedom is 0
• Complex Root of Quadratic Function

v0.25.0

New Features

• Matrix
  • isSingular
  • isNonsingular
  • isInvertible
  • leadingPrincipalMinor
  • isPositiveDefinite
  • isPositiveSemidefinite
  • isNegativeDefinite
  • isNegativeSemidefinite
• Number Theory
  • Integer coprime
• Arithmetic
  • digitSum
  • digitalRoot
• Basic sequences
  • digitSum
  • digitalRoot

v0.24.0

New Features

• Arithmetic cube root
• Algebra cubic equation
• Matrix Kronecker sum
• Vector Kronecker product
• Number theory prime factorization

Improvements

• Improved quadratic equation edge case handling

v0.23.0

New Features

• Number Theory - Integers
  • Perfect powers
• Advanced Sequences
  • Perfect powers
  • Not perfect powers
  • Primes up to n
• Algebra
  • Quadratic equation

v0.22.0

New Features

• Circular statistics (directional statistics)
  • Circular mean
  • Resultant length
  • Mean resultant length
  • Circular variance
  • Circular standard deviation
  • Describe
• Finance profitability index

Improvements

• Update Finance payback to be both simple and discounted payback

v0.21.0

New Features

• Finance interest payment
• Finance principle payment on an annuity
• Finance payback
• Make files for unit tests, linting, and code coverage

v0.20.0

New Features

• Finance net present value
• Finance rate function
• Finance internal rate of return
• Finance modified internal rate of return
• Finance payment periods of an annuity

Improvements

• Update Newton's Method to handle non-convergence and infinite slopes.

v0.19.0

New Features

• Matrix sample mean
• Matrix mean deviation form
• Covariance matrix
• Matrix representation as array of column vectors
• Finance future value
• Finance present value

v0.18.0

New Features

• Joint entropy
• Rényi entropy
• Perplexity
• Matrix scalar division
• Finance: Annual Equivalent Rate (AER)

Improvements

• Fix vector pnorm to take absolute value of each element

Backwards Incompatible Changes

• Refactor distances and divergences from InformationTheory\Entropy to Statistics\Distance

v0.17.0

New Features

• Two-sample z significance test