Update a recipe step
This step method for update() takes named arguments as ... who's values
will replace the elements of the same name in the actual step.
## S3 method for class 'step' update(object, ...)
object |
A recipe |
... |
Key-value pairs where the keys match up with names of elements in the step, and the values are the new values to update the step with. |
For a step to be updated, it must not already have been trained. Otherwise,
conflicting information can arise between the data returned from
bake(object, new_data = NULL) and the information in the step.
library(modeldata) data(biomass) biomass_tr <- biomass[biomass$dataset == "Training",] biomass_te <- biomass[biomass$dataset == "Testing",] # Create a recipe using step_bs() with degree = 3 rec <- recipe( HHV ~ carbon + hydrogen + oxygen + nitrogen + sulfur, data = biomass_tr ) %>% step_bs(carbon, hydrogen, degree = 3) # Update the step to use degree = 4 rec2 <- rec rec2$steps[[1]] <- update(rec2$steps[[1]], degree = 4) # Prep both recipes rec_prepped <- prep(rec, training = biomass_tr) rec2_prepped <- prep(rec2, training = biomass_tr) # Juice both to see what changed bake(rec_prepped, new_data = NULL) bake(rec2_prepped, new_data = NULL) # Cannot update a recipe step that has been trained! ## Not run: update(rec_prepped$steps[[1]], degree = 4) ## End(Not run)
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