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

In fda: Functional Data Analysis

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

Details

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).

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).

Author(s)

Spencer Graves

References

Ramsay, James O., Hooker, Giles, and Graves, Spencer (2009), Functional data analysis with R and Matlab, Springer, New York.

Ramsay, James O., and Silverman, Bernard W. (2005), Functional Data Analysis, 2nd ed., Springer, New York.

Ramsay, James O., and Silverman, Bernard W. (2002), Applied Functional Data Analysis, Springer, New York.

See Also

fd, create.bspline.basis,

fda documentation built on Sept. 30, 2024, 9:19 a.m.