Given scores (coefficients), these functions calculate a linear
combination of two- or three-dimensional cosine tensor basis functions
on two- or three-dimensional domains using the C-library fftw3
(see http://www.fftw.org/).
dctFunction2D(scores, argvals, parallel = FALSE)dctFunction3D(scores, argvals, parallel = FALSE)
An object of class funData with N observations on
the two- or threedimensional domain specified by argvals,
corresponding to the linear combination of orthonormal cosine basis
functions.
A sparse matrix of dimension N x L, representing
the L scores (coefficients), where N is the number of
observations.
A list containing two or three numeric vectors, corresponding to the domain grid (x and y values for two-dimensional domains; x,y and z values fro three-dimensional domains.)
Logical. If TRUE, the coefficients for the basis
functions are calculated in parallel. The implementation is based on
the foreach function and requires a parallel
backend that must be registered before; see
foreach for details. Defaults to FALSE.
If the C-library fftw3 is not available when
the package MFPCA is installed, the functions are disabled an
will throw an error. For full functionality install the C-library
fftw3 from http://www.fftw.org/ and reinstall
MFPCA. This function has not been tested with
ATLAS/MKL/OpenBLAS.
univExpansion, idct2D,
idct3D, dctBasis2D,
dctBasis3D