step_log {recipes} | R Documentation |
step_log
creates a specification of a recipe step that will
log transform data.
step_log(recipe, ..., role = NA, trained = FALSE, base = exp(1), columns = NULL)
recipe |
A recipe object. The step will be added to the sequence of operations for this recipe. |
... |
One or more selector functions to choose which variables are
affected by the step. See |
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. |
base |
A numeric value for the base. |
columns |
A character string of variable names that will be (eventually)
populated by the |
An updated version of recipe
with the
new step added to the sequence of existing steps (if any).
step_logit
step_invlogit
step_hyperbolic
step_sqrt
recipe
prep.recipe
bake.recipe
set.seed(313) examples <- matrix(exp(rnorm(40)), ncol = 2) examples <- as.data.frame(examples) rec <- recipe(~ V1 + V2, data = examples) log_trans <- rec %>% step_log(all_predictors()) log_obj <- prep(log_trans, training = examples) transformed_te <- bake(log_obj, examples) plot(examples$V1, transformed_te$V1)