Routines for the Spherical Solver

The section describes Poisson Solver routines for the spherical case, their syntax, parameters, and return values. All flavors of the same routine are described together: single- and double-precision and periodic (having names ending in "p") and non-periodic (having names ending in "np").

These Poisson Solver routines also call the Intel® oneAPI Math Kernel Library FFT routines (described inFFT Functions), which enhance the performance of the Poisson Solver routines.

• ?_init_sph_p/?_init_sph_np
  Initializes basic data structures of the periodic and non-periodic Fast Helmholtz Solver on a sphere.
• ?_commit_sph_p/?_commit_sph_np
  Checks consistency and correctness of input data and initializes certain data structures required to solve the periodic/non-periodic Helmholtz problem on a sphere.
• ?_sph_p/?_sph_np
  Computes the solution of the spherical Helmholtz problem specified by the parameters.
• free_sph_p/free_sph_np
  Releases the memory allocated for the data structures used by the FFT interface.