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fft.fourier_convolution_matrix

fft.fourier_convolution_matrix​

Computes the Fourier convolution matrix for x and basis_coefficients.

The Fourier convolution matrix at location (i, j) gives the Fourier coefficient associated with the lattice vector obtained by subtracting the jth reciprocal lattice vector from the ith reciprocal lattice basis. See equation 8 from [2012 Liu].

Args:​

  • x: The array for which the Fourier coefficients are sought.
  • expansion: The field expansion to be used.

Returns:​

  • None: The coefficients, with shape (num_vectors, num_vectors).