Changes in version 0.4.0                        

New functions

spec_join()

  - Join multiple spectral tibbles: Combine two or more spectral
    datasets that share the same wavenumber column
  - Flexible join types: Support for "full" (default), "inner", and
    "left" joins
  - Conflict handling: Automatic suffix handling for duplicate column
    names
  - Validation: Comprehensive checks for input tibbles and wavenumber
    column consistency
  - Integration: Full compatibility with the tidyspec workflow and
    set_spec_wn() global settings

spec_values_at()

  - Extract values at specific wavenumbers: Retrieve spectral
    intensities at user-defined wavenumber positions
  - Multiple extraction methods:
      - "closest": Find nearest wavenumber matches (default)
      - "exact": Return only exact matches, NA for non-matches
      - "interpolate": Use linear interpolation between adjacent data
        points
  - Flexible output formats:
      - "wide": Wavenumbers as rows, samples as columns (default)
      - "long": Tidy format with wavenumber, sample, and value columns
  - Tolerance control: Set maximum allowed difference for closest
    matching
  - Use cases: Ideal for peak analysis, sample comparison, and creating
    datasets for statistical analysis

Enhancements

  - Both new functions follow tidyspec conventions with consistent
    parameter naming and behavior
  - Integration with the global wavenumber column system (set_spec_wn())
  - Comprehensive input validation and informative error messages
  - Support for the standard tidyspec warning system for parameter
    defaults

Documentation

  - Added comprehensive documentation with examples for both new
    functions
  - Detailed parameter descriptions and method explanations
  - Usage examples covering common spectroscopy workflows

                        Changes in version 0.3.0                        

New Features

Spectral Interpolation Functions

  - Added spec_interpolate_left() for interpolating spectral data to
    match reference wavenumber grids (left join style)
  - Added spec_interpolate_right() for combining datasets with
    interpolated reference data (right join style)
  - Added spec_interpolate_regular() for creating regular wavenumber
    grids with specified resolution
  - Support for multiple interpolation methods:
      - "linear" - Linear interpolation (base R)
      - "pchip" - Piecewise Cubic Hermite Interpolating Polynomial
        (requires pracma)
      - "spline" - Cubic spline interpolation (base R)
      - "akima" - Akima spline interpolation (requires akima)
  - Optional extrapolation control with extrapolate parameter
  - Automatic handling of overlapping column names with customizable
    suffixes
  - Consistent integration with tidyspec environment for automatic
    wavenumber column detection

Dependencies

  - Added pracma and akima to Suggests for advanced interpolation
    methods
  - Functions gracefully handle missing optional dependencies with
    informative error messages

Documentation

  - Comprehensive documentation for all interpolation functions with
    usage examples
  - Clear explanation of join-style behavior for spectral data alignment

                        Changes in version 0.2.0                        

New Features

Baseline Correction Functions

  - Added spec_blc_rubberband() function for rubberband baseline
    correction of spectral data
  - Added spec_bl_rubberband() function to extract rubberband baseline
    from spectral data
  - Rubberband method provides automatic baseline correction by
    connecting local minima points
  - Both functions support customizable segment length and baseline
    smoothing options

Improvements

  - Enhanced baseline correction options with rubberband algorithm
    alongside existing rolling ball method
  - Consistent API design between rolling ball and rubberband baseline
    functions

Documentation

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