polynomial_2d() creates a
list of basis
functions to be used as the fixed effect in
1 2 3
A length 2 numeric vector with maximum frequencies considered (x-axis and y-axis direction, respectively).
A length 2 numeric vector with lattice dimensions (N,M) to be used.
A length 2 numeric vector with degrees of the bivariate polynomial to be considered.
fourier_2d() is for 2-dimensional Fourier transform.
list of functions.
A paper with detailed description of the package can be found at https://arxiv.org/abs/2006.00383
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