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sshist 0.2.4

Bug Fixes

• plot.sshist(): added freq = FALSE to histogram call so the plot correctly displays density instead of frequency.

sshist 0.2.3

Performance Improvements

• ssvkernel(): replaced iterative FFT smoothing with frequency-domain windowing using mvfft, reducing O(M²) FFT calls to O(M) matrix operations.
• ssvkernel(): vectorized which.min lookups and precomputed distance matrices for cost evaluation.
• ssvkernel() CostFunction: fully vectorized local bandwidth selection, replacing the for (k in 1:L) loop with max.col and matrix operations.
• ssvkernel(): removed unnecessary t() transpose in MVFFT slicing and unused weight_fun() helper.
• common.R: fixed edge case in fftkernel_1d where Lmax could be zero, ensured max(1, ...) guard.

Visual Improvements

• plot.sshist(): redesigned data display — jittered points and rug now sit in a reserved negative-y strip below the histogram bars (to avoid overlap).
• plot.sskernel() and plot.ssvkernel(): same reserved-strip approach for consistent look across all plot methods.
• All plot methods: redrawn y-axis showing only non-negative density ticks, with a subtle separator at y = 0.

New Features

• Added iris dataset tests for all six estimators with concrete reference values (278 total tests).

Documentation

• Added link references in README.

sshist 0.2.2

CRAN Compliance Fixes

• Removed invalid \cr from \describe{} in package documentation, fixing “LaTeX Error: There’s no line here to end.”
• Quoted OpenMP and backends in DESCRIPTION to avoid spelling NOTE on CRAN.

sshist 0.2.1

README Fixes

• Removed YAML frontmatter (output: github_document) from README.Rmd and README.md.

sshist 0.2.0

New Features

• Added sskernel() for optimal 1D fixed-bandwidth kernel density estimation.
• Added sskernel2d() for optimal 2D fixed-bandwidth kernel density estimation.
• Added ssvkernel() for locally adaptive 1D kernel density estimation (Shimazaki & Shinomoto 2010).
• Added ssvkernel2d() for locally adaptive 2D kernel density estimation (Abramson’s method).
• Added bootstrap confidence interval support for all kernel density estimators.
• Added C++ backends for 2D KDE cost computation, pilot density, and grid evaluation with OpenMP parallelism.
• Added ncores parameter to sshist() for multithreaded computation.

Algorithm Improvements

• Re-implemented sshist() with cleaner exhaustive search logic, exactly matching the original Python/MATLAB reference algorithms.
• Added resolution guard (anti-comb effect) with N_max = Range / (2 * Min_Resolution).
• Improved 2D histogram cost computation with pre-computed Y-bin indices for significant speedup.
• Added auto-expanding grid search for kernel bandwidth optimization.

Documentation

• Added vignettes: “Introduction to sshist” and “ggplot2 Visualization”.
• Added comprehensive S3 plot/print methods for all estimator classes.
• Updated README with complete function summary table.

Internal Changes

• Split code into modular R files: sshist.R, sskernel.R, ssvkernel.R, common.R.
• Updated to roxygen2 8.0 / Config/roxygen2/version format.
• Removed cost and n_tested fields from sshist return value (simplified output).
• Added C++ Rcpp functions: get_tau_bounds_cpp, compute_sskernel2d_cost_cpp, compute_pilot_density_cpp, compute_kde2d_cpp.

sshist 0.1.3

Algorithm Improvements

• Updated the binning resolution limit formula to N_max = Range / (2 * Min_Resolution) to prevent the “comb effect” (sampling artifacts). This change aligns the R implementation with the author’s reference code.
• The n_max parameter in sshist() is now strictly bounded by the resolution limit to prevent overfitting.

Documentation

• Fixed formatting in the DESCRIPTION file.
• Updated the faithful dataset examples in README.md to reflect the corrected optimal bin calculations (N changed from 37 to 21).
• Added CRAN download badges to README.md.
• Expanded reference links in README.md to include the original toolboxes and GitHub repositories from the algorithm’s authors.

sshist 0.1.2

CRAN Submission Fixes

• Fixed DESCRIPTION file reference formatting:
  • Added author names (Shimazaki and Shinomoto) to citation
  • Wrapped ‘C++’ in single quotes to comply with CRAN formatting requirements
• Improved documentation:
  • Added \value tags to all exported S3 method documentation files
  • Added comprehensive descriptions of return values and side effects for plot and print methods
  • Updated print methods to return objects invisibly following R best practices
  • Clear old images
• Fixed vignette:
  • Corrected graphical parameter handling in introduction.Rmd
  • Now properly stores and restores user’s par() settings

Internal Changes

• Added invisible(x) return statements to print.sshist() and print.sshist_2d() methods

sshist 0.1.1

Cosmetic fixes

• Fix installation links at Readme.Rmd.

sshist 0.1.0

• Initial CRAN submission.
• Added sshist() for 1D optimization (C++ optimized).
• Added sshist_2d() for 2D optimization.
• Added support for ggplot2 integration in examples.

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