Frick K (2026). Rpcop: Principal Curves of Oriented Points. R package version 1.2.3, https://github.com/kmfrick/Rpcop.

Delicado P, Huerta M (2003). “Principal Curves of Oriented Points: theoretical and computational improvements.” Computational Statistics, 18, 293–315. doi:10.1007/s001800300145.

Delicado P (2001). “Another Look at Principal Curves and Surfaces.” Journal of Multivariate Analysis, 77, 84–116. doi:10.1006/jmva.2000.1917.

Corresponding BibTeX entries:

  @Manual{,
    title = {Rpcop: Principal Curves of Oriented Points},
    author = {Kevin Michael Frick},
    year = {2026},
    note = {R package version 1.2.3},
    url = {https://github.com/kmfrick/Rpcop},
  }

  @Article{,
    title = {Principal Curves of Oriented Points: theoretical and
      computational improvements},
    author = {Pedro Delicado and Mario Huerta},
    journal = {Computational Statistics},
    year = {2003},
    volume = {18},
    pages = {293--315},
    doi = {10.1007/s001800300145},
  }

  @Article{,
    title = {Another Look at Principal Curves and Surfaces},
    author = {Pedro Delicado},
    journal = {Journal of Multivariate Analysis},
    year = {2001},
    volume = {77},
    pages = {84--116},
    doi = {10.1006/jmva.2000.1917},
  }