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Shuffle Variables

Source: R/shuffle.R
step_shuffle.Rd

step_shuffle creates a specification of a recipe step that will randomly change the order of rows for selected variables.

Usage

step_shuffle(
  recipe,
  ...,
  role = NA,
  trained = FALSE,
  columns = NULL,
  skip = FALSE,
  id = rand_id("shuffle")
)

Arguments

recipe

A recipe object. The step will be added to the sequence of operations for this recipe.

...

One or more selector functions to choose variables for this step. See selections() for more details.

role

Not used by this step since no new variables are created.

trained

A logical to indicate if the quantities for preprocessing have been estimated.

columns

A character string that contains the names of columns that should be shuffled. These values are not determined until prep() is called.

skip

A logical. Should the step be skipped when the recipe is baked by bake()? While all operations are baked when prep() is run, some operations may not be able to be conducted on new data (e.g. processing the outcome variable(s)). Care should be taken when using skip = TRUE as it may affect the computations for subsequent operations.

id

A character string that is unique to this step to identify it.

Value

An updated version of recipe with the new step added to the sequence of any existing operations.

Tidying

When you tidy() this step, a tibble with column terms (the columns that will be permuted) is returned.

See also

Other row operation steps: step_arrange(), step_filter(), step_impute_roll(), step_lag(), step_naomit(), step_sample(), step_slice()

Examples

integers <- data.frame(A = 1:12, B = 13:24, C = 25:36)

library(dplyr)
rec <- recipe(~ A + B + C, data = integers) %>%
  step_shuffle(A, B)

rand_set <- prep(rec, training = integers)

set.seed(5377)
bake(rand_set, integers)
#> # A tibble: 12 × 3
#>        A     B     C
#>    <int> <int> <int>
#>  1     5    13    25
#>  2     4    24    26
#>  3     9    23    27
#>  4     1    18    28
#>  5    11    14    29
#>  6    10    21    30
#>  7     6    19    31
#>  8     3    22    32
#>  9    12    16    33
#> 10     7    15    34
#> 11     2    17    35
#> 12     8    20    36

tidy(rec, number = 1)
#> # A tibble: 2 × 2
#>   terms id           
#>   <chr> <chr>        
#> 1 A     shuffle_3KJ40
#> 2 B     shuffle_3KJ40
tidy(rand_set, number = 1)
#> # A tibble: 2 × 2
#>   terms id           
#>   <chr> <chr>        
#> 1 A     shuffle_3KJ40
#> 2 B     shuffle_3KJ40