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All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

psp (development version)

psp 1.0.6 (2026-10-06)

Sampling results differ from 1.0.5 for the same seed, because the fixes below change the path the sampler takes.

Added

• A package website at https://lenarddome.com/psp/, built with pkgdown and deployed to GitHub Pages, with a tutorial that partitions the parameter space of prospect theory and a benchmark report comparing 1.0.6 to 1.0.5.
• The benchmark results and the scripts that produce them in benchmarks/.
• A recipe that partitions ALCOVE’s parameter space on the six Shepard, Hovland and Jenkins (1961) problems, following Pitt et al. (2006), with the scripts and saved results it reads in vignettes/articles/alcove/.
• benchmarks/benchmark.R for comparing the speed of two builds of the package.
• Tests for the sampler’s invariants (centres, counts, saved output, pattern identity, control validation) and for the contract with model and discretize.

Changed

• The pspGlobal() documentation cites the published version of g-distance (Dome & Wills, 2025, Psychological Review) instead of the preprint.
• pspGlobal matches ordinal patterns with a hash table in a single pass instead of five pairwise comparison loops over every stored pattern, and no longer copies the stored patterns on every iteration.
• model and discretize are called through one error-protected block per iteration instead of one per call, which removes two setjmp system calls per evaluation on macOS.
• Output files are opened once per run instead of on every write, and each row is written in a single call.
• Saved csv values are formatted with std::to_chars where the compiler supports it (macOS 13.3 or later, libstdc++ 11 or later), which makes writing them about 5 times faster than in 1.0.5. Other platforms use %.17g, which is about 45% slower than 1.0.5 because it writes full precision.
• model output of the wrong length or type, and discretize output that is not a dimensionality x dimensionality numeric matrix, now stop with a message that names the problem instead of an Armadillo error.

Fixed

• New ordinal patterns were sampled from the wrong centre: LastEvaluatedParameters appended rows for stored patterns that were not seen instead of for new patterns, so up to half of the newly discovered regions were explored from a point in another region. Each pattern’s centre is now the last parameter set that produced it.
• The first ordinal pattern was counted one extra time.
• The first iteration only proposed from the first pattern instead of from every underpopulated pattern found by init.
• Identical ordinal patterns containing NaN were stored as a new pattern on every evaluation.
• Saved csv files rounded parameters and model outputs to 6 significant digits; they are now written with full double precision, which makes the files about 2.7 times larger.

psp 1.0.5 (2026-01-15)

Changed

• Modernize tests by removing deprecated testthat::context() usage (84d0b19).
• Keep src/Makevars minimal, linking LAPACK, BLAS and FLIBS only (97cf4e9).

Fixed

• Armadillo helper edge cases in pspGlobal that caused null subviews and undefined behaviour (e60c3b3, 4ac2b01).

psp 1.0.2 (2024-07-24)

This is the last feature update from me. If you want to add new features, please get in touch (@lenarddome).

Fixed

• Continuous model output was not updated after the first iteration (69ed028).
• Typo in the package documentation (67fa59d).

psp 1.0.0 (2023-08-17)

Released on CRAN. This version introduces API-breaking changes. For a full list of feature changes since the previous CRAN release, see docs/CHANGELOG.md.

Added

• Model outputs (continuous variables) can be saved to disk (6d51dce).
• Multiple starting points can be defined for the sampling (d407392).

Changed

• Breaking: model evaluation functions are separated from discretization functions (6d51dce).

psp 0.5.8 (2022-08-16)

Added

• A C++ implementation of the parameter space partitioning routine, pspGlobal, that will take over from psp_global and psp_control (c75d02f).
• pspGlobal returns the number of iterations run (3b3bd0d).

Changed

• NA values are not allowed in model outputs (8ee7247).

Deprecated

• psp_global now shows a deprecation message. It will be removed once pspGlobal is complete (b52126d).

Removed

• The S3 class, to avoid redundancy and feature creep (c0f5f92).

Fixed

• The global R seed interfered with random sampling (358eee7).
• pspGlobal recruited unique inequality matrices more than once (5693543).
• Population parameters had no effect (5693543, 7648f47).

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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