Principal curve ordering — pcurve_ordering • smoothEMr

Principal curve ordering

pcurve_ordering(
  X,
  smoother = c("smooth_spline", "lowess", "periodic_lowess"),
  thresh = 0.001,
  maxit = 10,
  stretch = 2,
  approx_points = FALSE,
  scale01 = TRUE,
  orient_by_pc1 = TRUE
)

Arguments

X: numeric matrix (n x D).
smoother: a function (recommended) or a name like "smooth_spline".
thresh, maxit, stretch, approx_points: passed to princurve::principal_curve.
scale01: logical; if TRUE, rescale returned t to [0,1].
orient_by_pc1: logical; if TRUE, flip sign to align with PC1.

Value

list(t, keep_idx, fit)