Changes in version 0.1.0.9000                      

                 Changes in version 0.1.0 (2026-10-22)                  

First release.

  - fft_c2c(), fft_r2c() and fft_c2r() compute complex, real-to-complex
    and complex-to-real discrete Fourier transforms over any axes of an
    array, with SciPy's crop-or-pad n and norm = "backward", "ortho",
    "forward" or "none" (the unnormalised convention of fftwtools and
    stats::fft()).
  - With axes = NULL, fft_r2c() and fft_c2r() halve the first dimension,
    the contiguous one in R, as fftwtools' 2-D and 3-D real transforms
    do; give axes explicitly to halve the last axis listed, as SciPy
    does.
  - Results are bit-identical whatever the number of threads:
    zufft_info()$fp_contract is "off" for every build that cannot fuse
    multiply-adds, which includes all of CRAN's.
  - fft_dct() and fft_dst() compute discrete cosine and sine transforms
    of types 1 to 4 and their inverses over any axes, with SciPy's
    definitions, norm and orthogonalize.
  - fft_next_len() and fft_prev_len() find fast transform lengths;
    fft_freq(), fft_rfreq(), fft_shift() and fft_ishift() are SciPy's
    frequency and shift helpers.
  - fft_stats() and mvfft_stats() are drop-in replacements for
    stats::fft() and stats::mvfft().
  - workers runs a transform on several threads, through zufft's own
    lazy thread pool; fft_workers(), with_fft_workers() and
    local_fft_workers() set the default. Results do not depend on the
    number of threads, and forked children (parallel::mclapply()) are
    safe.
  - A registered C table and the header inst/include/zufft.h let other
    packages call the transforms from C with LinkingTo: zufft, from any
    thread.
  - Setting the environment variable ZUFFT_CXXFLAGS (for example to
    "-march=native") before installing from source builds zufft for the
    local CPU on Linux and macOS; see the README.
  - vignette("migrating-from-fftwtools") maps every fftwtools function
    to zufft; an article covers scipy.fft users.
  - Bundles the BSD-licensed FFT subset of ducc0 (the files and commit
    SciPy vendors) and compiles it.
  - zufft_info() reports the vendored ducc0 and SciPy commits, the SIMD
    backend and width, fused multiply-add support, the threading mode
    and the complex path.