psi_equation_cpp function

(C++) Equation of the Psi Dissimilarity Score

Equation to compute the psi dissimilarity score (Birks and Gordon 1985). Psi is computed as $\psi = (2a / b) - 1$, where $a$ is the sum of distances between the relevant samples of two time series, and $b$ is the cumulative sum of distances between consecutive samples in the two time series. If a is computed with dynamic time warping, and diagonals are used in the computation of the least cost path, then one is added to the result of the equation above.

psi_equation_cpp(a, b, diagonal = TRUE)

Arguments

• a: (required, numeric) output of cost_path_sum_cpp() on a least cost path.
• b: (required, numeric) auto sum of both sequences, result of auto_sum_cpp().
• diagonal: (optional, logical). Must be TRUE when diagonals are used in dynamic time warping and for lock-step distances. Default: FALSE.

Returns

numeric

See Also

Other Rcpp_dissimilarity_analysis: psi_dtw_cpp(), psi_ls_cpp(), psi_null_dtw_cpp(), psi_null_ls_cpp()