step_harmonic — step_harmonic • hydrorecipes

Add sin and cos terms for harmonic analysis

Usage

step_harmonic(
  .rec,
  terms,
  frequency = NA_real_,
  cycle_size = NA_real_,
  starting_value = 0,
  role = "predictor",
  skip = FALSE,
  keep_original_cols = FALSE,
  ...
)

Arguments

.rec: the R6 recipe object.
terms: the unquoted names of the variables to use or a selector function. terms replaces the `...` of the recipes package but requires variables to be included within `c()`. For example to include variables x and y you would write `c(x,y)` in the hydrorecipes package.
frequency: numeric vector - the frequencies of the sin and cos curves
cycle_size: numeric - the period of the sin and cos curves
starting_value: numeric - the starting position of the sin and cos curves. This may be specified to have more control over the signal phase.
role: character - the name of the role
skip: logical - should the step be skipped
keep_original_cols: logical - keep the original columns or replace them
...: additional arguments

Value

an updated recipe

Examples

dat <- data.frame(x = 1:10, y = rnorm(10))

rec <- recipe(y~x, data = dat) |>
       step_harmonic(x,
                     frequency = 2.0,
                     cycle_size = 4.0,
                     starting_value = 0.0)