encode_one_hot: Create one hot encoder, that turns factor variables into...
In rtsho/preprocessr: Functions to make your preprocessing life easier.

Description Usage Arguments Details Examples

Create one hot encoder, that turns factor variables into dummy variables.

1	encode_one_hot(vars = categoricals, sparse = FALSE)

`vars`	Function or formula that returns selected columns from a data.frame. Alternatively, character vector of column names.
`sparse`	If true, return value will be a sparse Matrix of class dcgMatrix. Otherwise, regular data frame.

If sparse is TRUE, this should be the last step of your preprocessing pipeline.

df <- data.frame(A=c("a1","a1","a2","a3"), B=c("b1", "b2", "b3", "b4"), X=c(1,2,3,4))
prep <- encode_one_hot()
prep$fit(df)
prep$transform(df)
# or more succintly
prep$fit_transform(df)