NEWS.md

In fcaR: Formal Concept Analysis

fcaR 1.2.1

Enhancements:

• Other logics have been implemented. Now, we can use fc$use_logic() to select one of the available_logics().
• Improved export to LaTeX.

Bugfixes:

• Fixes required by the new version of Matrix and the new use of HTML Tidy in R 4.2.
• Some rounding errors might induce errors in the computations. These has been fixed.

fcaR 1.2.0

• Fixes required by the new version of Matrix and the new use of HTML Tidy in R 4.2.

fcaR 1.1.1

Enhancements:

• The user can control the number of decimal digits when exporting to LaTeX or when printing formal contexts, concept lattices and implications. Just use fcaR_options(decimal_places = n), where n is the number of desired decimal digits.

New functionality:

• Now the package uses the settings package to manage several options. Currently, the only option is the number of decimal digits to use when printing or exporting to LaTeX.

Bugfixes:

• Fixed exporting to latex with special characters such as $, _, etc.

fcaR 1.1.0

Enhancements:

• Better printing of Sets.
• More optimized ConceptLattice class. Now it inherits from a ConceptSet superclass with generic functions.

New functionality:

• Added function to compute the difference of two Sets.
• Added function to compute the dual of a FormalContext.
• Now one can create a FormalContext from a CSV, CXT or RDS file directly, without needing to "load()" it.
• FormalContexts can now be saved to CXT format, in addition to RDS.
• Added functions to compute the top and the bottom of a concept lattice.
• Added new function sub() to extract a single Concept from a ConceptSet.
• Added functions %holds_in% and %respects%, which check the validity of a set of implications in a formal context, and if a list of attribute sets respect an implication set.
• Added functions %entails% and %~% to check the entailment and equivalence between two implication sets.
• Added new convenience function to map attributes between Sets, so computing intents, extents and closures is more robust.
• Added new functions %&% and %|% that compute the intersection (logical and) and the union (or operation) on Sets.
• Conceptual scaling, including nominal, ordinal, interordinal, biordinal and interval scales for many-valued formal contexts. Also, computation of background knowledge from the applied scales and of the implications that hold in the formal context. Added new vignette.

Breaking changes:

• The former SparseSet and SparseConcept classes are now named Set and Concept. Thus, to create an object of these types, just use Set\$new(...) or Concept\$new(...). Analogously, the former function as_SparseSet() is now as_Set().

Bugfixes:

• Minor bugfixes in several functions.

fcaR 1.0.7

Bugfixes:

• Minor bugfixes in several functions.
• Fixed C source that could generate some problems.

Enhancements:

• Reduced number of dependencies.
• Better printing of FormalContexts, specially for binary FormalContexts.

fcaR 1.0.6

Bugfixes:

• Detect if R has been built with no long double capabilities and warn the user if she tries to plot FormalContexts and ConceptLattices.

fcaR 1.0.5

Bugfixes:

• Fixes #17. The reduced set of implications after performing closure with reduce == TRUE now stores the matrix I, so it can be re-exported to the arules format.

Enhancements:

• More efficient version of the simplification rule. Now it performs linearly on the number of implications.
• Added a way to extend the equivalence rules by means of the registry package. This has been used to introduce the "Right Simplification" and the "Reorder" rules.
• New vignette to show how to extend equivalence rules in the package.
• More efficient version of the NextClosure algorithm to mine concepts and implications.

fcaR 1.0.4

Bugfixes:

• Fixes #15. A problem with version 1.6-6 of arules.
• Bugfix when using the trivial context (S, S, !=)
• Several bugfixes in LaTeX output.

Enhancements:

• Added export of plots to TiKZ to be included in LaTeX documents.
• Faster computation of concepts and implications.
• Added new function to decompose a concept in its irreducible components.
• Added function to compute the canonical basis from an ImplicationSet.

fcaR 1.0.3

• Changes to some C functions since they could potentially give a segfault.

fcaR 1.0.2

• Made minor changes in the DESCRIPTION.

fcaR 1.0.1

• Made changes suggested by CRAN:

• Added examples in the documentation.

• Changed cat() to message() in functions not related to printing.

• Added proper contributors.

• Updated vignettes

fcaR 1.0.0

• Added a NEWS.md file to track changes to the package.

fcaR documentation built on April 28, 2023, 1:11 a.m.