Package: fastlpr
Title: Fast Local Polynomial Regression and Kernel Density Estimation
Version: 1.0.1
Authors@R: c(
    person("Ying", "Wang", email = "yingwangrigel@gmail.com", role = c("aut", "cre")),
    person("Min", "Li", email = "minli.231314@gmail.com", role = "aut")
    )
Description: Non-Uniform Fast Fourier Transform ('NUFFT')-accelerated
        local polynomial regression and kernel density estimation for
        large, scattered, or complex-valued datasets. Provides
        automatic bandwidth selection via Generalized Cross-Validation
        (GCV) for regression and Likelihood Cross-Validation (LCV) for
        density estimation. This is the 'R' port of the 'fastLPR'
        'MATLAB'/'Python' toolbox, achieving O(N + M log M)
        computational complexity through custom 'NUFFT' implementation
        with Gaussian gridding. Supports 1D/2D/3D data, complex-valued
        responses, heteroscedastic variance estimation, and confidence
        interval computation. Performance optimized with vectorized 'R'
        code and compiled helpers via 'Rcpp'/'RcppArmadillo'. Extends
        the 'FKreg' toolbox of Wang et al. (2022)
        <doi:10.48550/arXiv.2204.07716> with 'Python' and 'R' ports.
        Applied in Li et al. (2022)
        <doi:10.1016/j.neuroimage.2022.119190>. Uses 'NUFFT' methods
        based on Greengard and Lee (2004)
        <doi:10.1137/S003614450343200X>, binning-accelerated kernel
        estimation of Wand (1994) <doi:10.1080/10618600.1994.10474656>,
        and local polynomial regression framework of Fan and Gijbels
        (1996, ISBN:978-0412983214).
License: GPL-3
Encoding: UTF-8
ByteCompile: false
Depends: R (>= 4.2.0)
Imports: stats, utils, grDevices, graphics, compiler, Rcpp (>= 1.0.0)
Suggests: testthat (>= 3.0.0), akima, rgl, R.matlab
LinkingTo: Rcpp, RcppArmadillo
SystemRequirements: GNU make
URL: https://github.com/rigelfalcon/fastLPR
BugReports: https://github.com/rigelfalcon/fastLPR/issues
RoxygenNote: 7.3.1
NeedsCompilation: yes
Packaged: 2026-07-20 06:37:39 UTC; root
Author: Ying Wang [aut, cre], Min Li [aut]
Maintainer: Ying Wang <yingwangrigel@gmail.com>
Config/pak/sysreqs: make
Repository: https://cran.r-universe.dev
Date/Publication: 2026-04-21 09:55:16 UTC
RemoteUrl: https://github.com/cran/fastlpr
RemoteRef: HEAD
RemoteSha: 957f391906e0d332832564c565d957c082268874