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basis.generate_expansion

basis.generate_expansion​

Generates the expansion for the specified real-space basis.

Args:​

  • primitive_lattice_vectors: The primitive vectors for the real-space lattice.
  • approximate_num_terms: The approximate number of terms in the expansion. To maintain a symmetric expansion, the total number of terms may differ from this value.
  • truncation: The truncation to be used for the expansion.

Returns:​

  • None: The Expansion. The basis coefficients of the expansion are sorted so that the zeroth-order term is first.