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Changelog

This documents notable changes in CurveFit.jl. The format is based on Keep a Changelog.

v[1.9.1] - 2026-04-25

Fixed

  • Fixed support for reinit!()'ing nonlinear fit caches when using the new AutoSpecializeCallable wrapper from NonlinearSolve (#98).

v1.9.0 - 2026-04-24

Added

  • Added an absolute_sigma argument to vcov() and related functions to control whether the covariance matrix is rescaled by reduced χ² (#97).
  • Added a weighted argument to residuals() and related functions to control whether the returned residuals are scaled by the problem weights, if any (#97).

Changed

  • The resid field of CurveFitSolution now consistently stores the weighted residuals for both linear and nonlinear fits (#97). Previously the unweighted residuals were stored for linear fits.

Fixed

  • vcov() and related functions previously ignored the problem weights, they are now taken into account when present (#97).

v1.8.1 - 2026-04-13

Changed

  • Added support for SciMLBase v3 (#95).

v1.8.0 - 2026-04-07

Changed

  • Added support for RecursiveArrayTools 4.0 (#94).

v1.7.0 - 2026-03-02

Added

  • Added a precompilation workload to reduce TTFX (#90).

v1.6.0 - 2026-02-28

Added

  • Implemented support for bounds for some algorithms (#87).

v1.5.1 - 2026-02-16

Changed

  • Fixed compatibility with NonlinearSolveFirstOrder.jl v2 (#86).

v1.5.0 - 2026-02-14

Changed

  • CurveFit now depends only on NonlinearSolveFirstOrder.jl to reduce dependencies (#85). The default algorithm remains the same.

v1.4.0 - 2026-01-31

Added

  • Implemented margin_error() (#81).
  • Added support for standard deviation weights for linear fits (#80).

Changed

v1.3.0 - 2026-01-26

Added

  • Added support for standard deviation weights for nonlinear fits (#79).

Changed

  • Breaking: reinit!(::GenericNonlinearCurveFitCache) now takes in u0 as a keyword argument rather than a positional argument for consistency with NonlinearSolve.jl (#79).

Fixed

  • Fixed reinit!(::GenericNonlinearCurveFitCache) to allow passing a new x/y as well as u0 (#79).

v1.2.0 - 2026-01-21

Added