Extract either all or only the interior knots from an object of class
basisfd, fd, or fdSmooth.
# S3 method for fd
knots(Fn, interior=TRUE, ...)
# S3 method for fdSmooth
knots(Fn, interior=TRUE, ...)
# S3 method for basisfd
knots(Fn, interior=TRUE, ...)Numeric vector. If 'interior' is TRUE, this is the params
component of the bspline basis. Otherwise, params is
bracketed by rep(rangeval, norder(basisfd).
an object of class basisfd or containing such an object
logical:
if TRUE, Fn[["params"]] are returned.
Else, nord <- norder(Fn); rng <- Fn[['rangeval']]; return c(rep(rng[1], nord), Fn[["params"]], rep(rng[2], nord))
ignored
Spencer Graves
The interior knots of a bspline basis are stored in the
params component. The remaining knots are in the
rangeval component, with multiplicity norder(Fn).
fd,
create.bspline.basis,