# harmonic error

    Code
      recipe(osc ~ time_var, data = harmonic_dat) %>% step_harmonic(time_var,
        frequency = 1, cycle_size = NA)
    Condition
      Error in `step_harmonic()`:
      ! cycle_size must have at least one non-NA numeric value.

---

    Code
      recipe(osc ~ time_var, data = harmonic_dat) %>% step_harmonic(time_var,
        frequency = 1, starting_val = 0, cycle_size = NA)
    Condition
      Error in `step_harmonic()`:
      ! cycle_size must have at least one non-NA numeric value.

---

    Code
      recipe(osc ~ time_var, data = harmonic_dat) %>% step_harmonic(time_var,
        frequency = 1, starting_val = 0, cycle_size = "a")
    Condition
      Error in `step_harmonic()`:
      ! cycle_size must have at least one non-NA numeric value.

---

    Code
      recipe(osc ~ time_var, data = harmonic_dat) %>% step_harmonic(time_var,
        frequency = 1, starting_val = "a", cycle_size = 86400)
    Condition
      Error in `step_harmonic()`:
      ! starting_val must be NA, numeric, Date or POSIXt

---

    Code
      recipe(osc ~ time_var, data = harmonic_dat) %>% step_harmonic(time_var,
        frequency = 1, starting_val = factor("a"), cycle_size = 86400)
    Condition
      Error in `step_harmonic()`:
      ! starting_val must be NA, numeric, Date or POSIXt

# harmonic NA in term

    Code
      recipe(osc ~ time_var, data = harmonic_dat) %>% step_harmonic(time_var,
        frequency = 4, cycle_size = 86400) %>% prep() %>% bake(new_data = NULL)
    Condition
      Error in `step_harmonic()`:
      Caused by error in `bake()`:
      ! variable must have at least one non-NA value

# harmonic character in term

    Code
      recipe(osc ~ time_var, data = harmonic_dat) %>% step_harmonic(time_var,
        frequency = 4, cycle_size = 86400) %>% prep() %>% bake(new_data = NULL)
    Condition
      Error in `step_harmonic()`:
      Caused by error in `prep()`:
      ! All columns selected for the step should be date, datetime, or numeric.

# harmonic cycle_size length

    Code
      recipe(osc ~ time_var_1 + time_var_2 + time_var_3, data = harmonic_dat) %>%
        step_harmonic(time_var_1, time_var_2, time_var_3, frequency = 4, cycle_size = c(
          86400, 86400)) %>% prep()
    Condition
      Error in `step_harmonic()`:
      Caused by error in `prep()`:
      ! `cycle_size` must be length 1 or the same  length as the input columns

# harmonic starting_val length

    Code
      recipe(osc ~ time_var_1 + time_var_2 + time_var_3, data = harmonic_dat) %>%
        step_harmonic(time_var_1, time_var_2, time_var_3, frequency = 4,
          starting_val = c(86400, 86400), cycle_size = 86400) %>% prep()
    Condition
      Error in `step_harmonic()`:
      Caused by error in `prep()`:
      ! `starting_val` must be length 1 or the same  length as the input columns

# check_name() is used

    Code
      prep(rec, training = dat)
    Condition
      Error in `step_harmonic()`:
      Caused by error in `bake()`:
      ! Name collision occured. The following variable names already exists:
      i  mpg_sin_1

# empty printing

    Code
      rec
    Message
      
      -- Recipe ----------------------------------------------------------------------
      
      -- Inputs 
      Number of variables by role
      outcome:    1
      predictor: 10
      
      -- Operations 
      * Harmonic numeric variables for: <none>

---

    Code
      rec
    Message
      
      -- Recipe ----------------------------------------------------------------------
      
      -- Inputs 
      Number of variables by role
      outcome:    1
      predictor: 10
      
      -- Training information 
      Training data contained 32 data points and no incomplete rows.
      
      -- Operations 
      * Harmonic numeric variables for: <none> | Trained

# keep_original_cols - can prep recipes with it missing

    Code
      rec <- prep(rec)
    Condition
      Warning:
      'keep_original_cols' was added to `step_harmonic()` after this recipe was created.
      Regenerate your recipe to avoid this warning.

# printing

    Code
      print(rec)
    Message
      
      -- Recipe ----------------------------------------------------------------------
      
      -- Inputs 
      Number of variables by role
      outcome:    1
      predictor: 10
      
      -- Operations 
      * Harmonic numeric variables for: hp

---

    Code
      prep(rec)
    Message
      
      -- Recipe ----------------------------------------------------------------------
      
      -- Inputs 
      Number of variables by role
      outcome:    1
      predictor: 10
      
      -- Training information 
      Training data contained 32 data points and no incomplete rows.
      
      -- Operations 
      * Harmonic numeric variables for: hp | Trained