one_of() as a valid selector

[franperezlopez]

could you please add this feature to your backlog? I think I'd be very helpful to select columns via their own names, and not using integer indexes (num_range())

thanks!! 🙇

[topepo]

No problem!

> library(recipes)
Loading required package: dplyr

Attaching package: ‘dplyr’

The following objects are masked from ‘package:stats’:

    filter, lag

The following objects are masked from ‘package:base’:

    intersect, setdiff, setequal, union


Attaching package: ‘recipes’

The following object is masked from ‘package:stats’:

    step

> library(caret)
Loading required package: lattice
Loading required package: ggplot2
> 
> set.seed(654)
> dat <- twoClassSim(10)
> some_vars <- c("Nonlinear1", "Nonlinear2")
> 
> rec <- recipe(Class ~ ., data = dat) %>%
+   # step_center(num_range(prefix = "TwoFactor", range  = 1:2)) %>%
+   step_scale(one_of(some_vars)) %>%
+   prep %>%
+   print
step 1 scale training 
Data Recipe

Inputs:

      role #variables
   outcome          1
 predictor         15

Training data contained 10 data points and no missing data.

Steps:

Scaling for Nonlinear1, Nonlinear2 [trained]
> 

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