FNFT
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Stores additional options for the routine fnft_nsep. More...
#include <fnft_nsep.h>
Stores additional options for the routine fnft_nsep.
Use the fnft_nsep_default_opts routine in order to generate a new variable of this type with default options and modify as needed.
fnft_nsep_opts_t::bounding_box |
Array of four reals. Defines a box in the complex plane that is used for filtering:
bounding_box[0] <= real(lambda) <= bounding_box[1]
bounding_box[2] <= imag(lambda) <= bounding_box[3]
fnft_nsep_opts_t::discretization |
fnft_nsep_opts_t::Dsub |
Approximate number of samples after subsampling when SUBSAMPLE_AND_REFINE is used during localization. See fnft_nsep_loc_t. When set to zero (default), the algorithm will choose Dsub automatically such that the complexity of finding initial guesses is O(D log^2 D).
fnft_nsep_opts_t::filtering |
Controls how both the main spectrum and the auxiliary spectrum are filtered. It is recommended to use MANUAL filtering as accurate filtering reduces the runtime of the routine.
Should be of type fnft_nsep_filt_t.
fnft_nsep_opts_t::floquet_range |
Array of two reals. The mainspec variable will contain the z that solve Delta(z)=rhs, where Delta(z)=0.5 trace{monodromy matrix(z)} and rhs is varied over a equidistant grid of fnft_nsep_opts_t::points_per_spine values with the first grid point being floquet_range[0] and last grid point being floquet_range[1]. By default, floquet_range={-1,1} and points_per_spine=2, which corresponds to the conventional main spectrum (=endpoints of spines). By choosing more points_per_spine, one can determine the spines (or bands) connecting the points in the main spectrum.
fnft_nsep_opts_t::localization |
Controls how both the main spectrum and the auxiliary main spectrum points are localized.
Should be of type fnft_nsep_loc_t.
fnft_nsep_opts_t::max_evals |
Maximum number of function evaluations per root allowed for the refinement step during localization. Note that this is not necessarily the number of Newton iterations as Newton's method for higher order roots is used for some parts of the spectra.
fnft_nsep_opts_t::normalization_flag |
fnft_nsep_opts_t::points_per_spine |
fnft_nsep_opts_t::tol |
Tolerance used to stop the refinement of main and auxiliary spectrum. Should be positive or -1. In latter case, the algorithm chooses the tolerance.