Which term could a measured period be? — astro_term

Enumerates single terms and low-order combinations and returns those whose period matches, so an unidentified peak can be checked against the theory.

Usage

astro_term_search(
  period_kyr,
  age_ma = 0,
  tol = 0.03,
  max_order = 2,
  k_yr = NULL,
  data_dir = NULL
)

period_kyr: The measured period of the unidentified peak, in kyr (numeric, single value > 0). Required, no default.
age_ma: Age in Ma (numeric, single value, 0 to 4429) used to take the precession constant of the k-bearing terms from astrogeo22 (ignored when k_yr is given). Default=0.
tol: Relative tolerance for a match (numeric, > 0): a term is returned when |period - period_kyr| / period_kyr <= tol, e.g. 0.03 = 3%. Default=0.03.
max_order: Highest order of the candidate terms (numeric): 1 tests single terms only, 2 (or more) also their harmonics 2(term) and the sums and differences of two terms. Default=2.
k_yr: Your own precession constant k, as a period in years (numeric, > 0), used instead of the AstroGeo22 value; NULL takes it from astrogeo22(age_ma)$p_arcsec. Default=NULL.
data_dir: Folder that contains the data files AstroGeo22.txt and La04gisi.csv (character path); NULL uses the copy installed with the package. Default=NULL.

data.frame of candidate terms sorted by |offset from the measurement|