Changes in version 0.0.2.9000                      

                 Changes in version 0.0.2 (2026-04-17)                  

New features

  - New as_diagram() generic and methods for persistence and PHom
    classes, enabling round-trip conversion back to the diagram class
    used by {TDA} (#53).

Bug fixes

  - as_persistence.diagram() now correctly handles diagram objects whose
    Birth and Death columns appear in a different order, which can occur
    with some {TDA} filtrations (#52).
  - Graphics options are now properly restored to the user's original
    settings after being temporarily changed (#41).

Minor improvements

  - {TDA} functions are now called with explicit TDA:: namespace
    prefixes and print.progress = FALSE for cleaner output (#41).
  - Tests for {ripserr} integration are now run conditionally on
    {ripserr} being installed, removing it as a hard suggested
    dependency (#41).
  - The vignette no longer requires {ggplot2} or {scales}, reducing
    optional dependencies for building the documentation (#46, closes
    #45).
  - Vendored {cpp11} headers have been removed; the package now relies
    on the {cpp11} headers provided by the installed package, allowing
    it to benefit from updated versions. The NO_LEGACY_NONAPI flag is
    set to comply with the R API going forward (#55).
  - Package description updated with references to the distance methods
    implemented (#41).

                 Changes in version 0.0.1 (2025-05-15)                  

This is a new submission to CRAN.

Goals

The {phutil} package is intended to be a low-level package for hosting
persistence data. It is part of the TDAverse suite of packages, which
are designed to provide a collection of packages for enabling machine
learning and data science tasks using persistent homology.

Current features

The package currently exposes:

  - a new data structure (the persistence class) for hosting persistence
    data;
  - a set of utility functions for coercing persistence data to and from
    other data structures (e.g., data.frame, tibble, list, matrix,PHom
    and diagram classes);
  - a set of utility functions for computing Bottleneck and Wasserstein
    distances between two persistence diagrams (bottleneck_distance()
    and wasserstein_distance()) and from a sample of persistence
    diagrams in a pairwise manner (bottleneck_pairwise_distance() and
    wasserstein_pairwise_distance()).

Dependencies

Messages, warnings and errors are relayed to the user using the {rlang}
package and the {cli} package which are both licensed under the MIT
license and with no dependency trail.

Computation of distances is performed using the BSD-licensed Hera C++
library. The code interfacing R and C++ is generated by the header-only
{cpp11} package which is MIT-licensed. Computation of pairwise distances
is parallelized over the number of pairs using OpenMP.