CODEWITHSUNDEEP
rdplyrtidyselect
Indrajeet Patil
Indrajeet Patil

Reputation: 4879

renaming column names with dplyr using tidyselect functions

I am trying to rename a few columns using dplyr::rename and tidyselect helpers to do so using some patterns.

How can I get this to work?

library(tidyverse)

# tidy output from broom (using development version)
(df <- broom::tidy(stats::oneway.test(formula = wt ~ cyl, data = mtcars)))

#> # A tibble: 1 x 5
#>   num.df den.df statistic   p.value method                                      
#>    <dbl>  <dbl>     <dbl>     <dbl> <chr>                                       
#> 1      2   19.0      20.2 0.0000196 One-way analysis of means (not assuming equ~

# renaming
df %>% 
  dplyr::rename(
  .data = .,
  parameter1 = dplyr::matches("^num"),
  parameter2 = dplyr::matches("^denom")
  )
#> Error: Column positions must be scalar

Created on 2020-01-12 by the reprex package (v0.3.0.9001)

Upvotes: 1

Views: 761

Answers (2)

akrun
akrun

Reputation: 886948

We can also rename from a named vector

library(dplyr)
library(stringr)
df %>% 
     rename(!!!set_names(names(df)[1:2], str_c('parameter', 1:2)))
# A tibble: 1 x 5
#  parameter1 parameter2 statistic   p.value method                                                  
#       <dbl>      <dbl>     <dbl>     <dbl> <chr>                                                   
#1          2       19.0      20.2 0.0000196 One-way analysis of means (not assuming equal variances)

Upvotes: 2

Nareman Darwish
Nareman Darwish

Reputation: 1261

Your code works fine with me, however here are some other shorter ways that can help you and you can try;

library(tidyverse)

# tidy output from broom (using development version)
(df <- broom::tidy(stats::oneway.test(formula = wt ~ cyl, data = mtcars)))

#> # A tibble: 1 x 5
#>   num.df den.df statistic   p.value method                                      
#>    <dbl>  <dbl>     <dbl>     <dbl> <chr>                                       
#> 1      2   19.0      20.2 0.0000196 One-way analysis of means (not assuming equ~

# renaming
df %>% 
  rename(parameter1 = matches("^num"),
         parameter2 = matches("^denom"))

# # A tibble: 1 x 5
# parameter1 parameter2 statistic   p.value method                                               
# <dbl>      <dbl>     <dbl>     <dbl> <chr>                                                
#   1          2       19.0      20.2 0.0000196 One-way analysis of means (not assuming..

df %>% 
  rename(parameter1 = contains("num"),
         parameter2 = contains("denom"))

# # A tibble: 1 x 5
# parameter1 parameter2 statistic   p.value method                                               
# <dbl>      <dbl>     <dbl>     <dbl> <chr>                                                
#   1          2       19.0      20.2 0.0000196 One-way analysis of means (not assuming..

df %>% 
  rename(parameter1 = starts_with("num"),
         parameter2 = starts_with("denom"))

# # A tibble: 1 x 5
# parameter1 parameter2 statistic   p.value method                                               
# <dbl>      <dbl>     <dbl>     <dbl> <chr>                                                
#   1          2       19.0      20.2 0.0000196 One-way analysis of means (not assuming..

Upvotes: 2

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