Skip to contents

Changelog

Source: NEWS.md

mathmodels 0.0.6

Bug fixes

  • AHP(): Extended the Random Index (RI) table from n = 11 to n = 15, and added validation for n > 15. Previously, AHP() would silently return NA for consistency ratios with more than 11 criteria.
  • grey_corr(): Fixed incorrect default weight direction in the internal validation; weights are now correctly validated against nrow(cmp) (number of evaluation objects) rather than ncol(cmp) (number of indicators).
  • DGM21(): Fixed the list(pred = fitted, ...) return value where fitted was undefined; corrected to list(fitted = pred, ...). Also fixed the initialization value x0 from a hard-coded constant to the first element of the input series X[1].
  • grey_corr_topsis(): Fixed an internal transpose error in the call to grey_corr() that caused dimension mismatch in non-square matrices.
  • z_mf(), pi_mf(), s_mf(): Rewrote the two-stage spline algorithm for all three membership functions. The original implementation used a single-stage approximation with logically unreachable second-phase conditions, causing values to fall outside the valid [0, 1] range for certain parameter configurations. The fix ensures proper two-stage spline behavior with exact midpoint values of 0.5.

Dependencies

  • Imports (new): Added MASS, purrr, readxl, rlang, stats, stringr, and tibble to DESCRIPTION/Imports. These were already used in code via @importFrom in NAMESPACE but were missing from the formal dependency declaration.
  • Suggests (new): Added deaR to DESCRIPTION/Suggests for DEA model functionality.

Parameter validation

  • Added input type and dimension validation (stopifnot() checks) for all exported functions, including checks for:
    • Data frame / matrix type verification
    • Vector length consistency
    • Non-negativity / positivity of weights
    • Matrix dimension bounds
    • Parameter range constraints

Testing

  • Added 178 test cases across 18 test files, achieving full coverage of all core modules:
Module Test file Tests
AHP test-AHP.R 8
Combine predictions test-combine_preds.R 5
Combine weights test-combine_weights.R 7
CRITIC weighting test-critic.R 5
CV weighting test-cv.R 4
Entropy weighting test-entropy.R 7
Fuzzy evaluation test-fuzzy.R, test-fuzzy_more.R 25
Grey analysis test-grey.R 10
Grey models test-grey_models.R 16
Inequality measures test-inequality.R 12
Linear sum test-linear_sum.R 4
Membership functions test-membership.R 19
PCA weighting test-pca.R 4
Preprocessing test-preprocess.R 21
Rank sum ratio test-rsr.R 5
System evaluation test-system_evaluation.R 9
TOPSIS test-topsis.R 5

Documentation

  • Updated function examples and documentation to reflect all parameter validation rules.
  • Added pkgdown website configuration (_pkgdown.yml). Once pushed to GitHub, the reference site will be automatically built and deployed to https://zhjx19.github.io/mathmodels/ via GitHub Actions.
  • Fixed a typo in the GitHub installation URL within README.md.
  • Updated README.md version badge from 0.0.5 to 0.0.6.
  • The comprehensive online manual is available at: https://zhjx19.github.io/mathmodels-book/

mathmodels 0.0.0.9000

  • Initial development version.