fda (version 5.1.4)

knots.fd: Extract the knots from a function basis or data object

Description

Extract either all or only the interior knots from an object of class basisfd, fd, or fdSmooth.

Usage

# S3 method for fd
knots(Fn, interior=TRUE, ...)
# S3 method for fdSmooth
knots(Fn, interior=TRUE, ...)
# S3 method for basisfd
knots(Fn, interior=TRUE, ...)

Arguments

Fn

an object of class basisfd or containing such an object

interior

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

Value

Numeric vector. If 'interior' is TRUE, this is the params component of the bspline basis. Otherwise, params is bracketed by rep(rangeval, norder(basisfd).

Details

The interior knots of a bspline basis are stored in the params component. The remaining knots are in the rangeval component, with mulltiplicity norder(Fn).

See Also

fd, create.bspline.basis,