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