Uses the package
fda to find a transformation matrix where the
columns are the different Fourier basis functions, evaluated at specified
points along the rows of the matrix.
an array of the specific points where the basis functions are evaluated at.
number of basis functions in the matrix.
indices corresponding to which rows of the matrix to keep. Default is to keep all rows.
A P x N discrete Fourier transformation matrix where P is equal to the
train and N is the number of basis. If
NULL then P equals the length of
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