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one_of() as a valid selector #85

franperezlopez opened this issue Aug 15, 2017 · 1 comment


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commented Aug 15, 2017

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!! 馃檱

topepo added a commit that referenced this issue Aug 16, 2017

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commented Aug 16, 2017

No problem!

> library(recipes)
Loading required package: dplyr

Attaching package:dplyrThe following objects are masked frompackage:stats:

    filter, lag

The following objects are masked frompackage:base:

    intersect, setdiff, setequal, union

Attaching package:recipesThe following object is masked frompackage:stats:


> 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


      role #variables
   outcome          1
 predictor         15

Training data contained 10 data points and no missing data.


Scaling for Nonlinear1, Nonlinear2 [trained]

@topepo topepo closed this Aug 23, 2017

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