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zufft 0.1.0

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.

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.