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Get a New Temporary Variable Name for a Dataset

Source: R/tmp_vars.R
get_new_tmp_var.Rd

Get a New Temporary Variable Name for a Dataset

Usage

get_new_tmp_var(dataset, prefix = "tmp_var")

Arguments

dataset

The input dataset

prefix

The prefix of the new temporary variable name to create

Value

The name of a new temporary variable as a symbol

Details

The function returns a new unique temporary variable name to be used inside dataset. The temporary variable names have the structure prefix_n where n is an integer, e.g. tmp_var_1. If there is already a variable inside datset with a given prefix then the suffix is increased by 1, e.g. if tmp_var_1 already exists then get_new_tmp_var() will return tmp_var_2.

See also

remove_tmp_vars()

Examples

library(dplyr, warn.conflicts = FALSE)
library(pharmaversesdtm)
data(dm)

tmp_var <- get_new_tmp_var(dm)
mutate(dm, !!tmp_var := NA)
#> # A tibble: 306 × 26
#>    STUDYID      DOMAIN USUBJID  SUBJID RFSTDTC RFENDTC RFXSTDTC RFXENDTC RFICDTC
#>    <chr>        <chr>  <chr>    <chr>  <chr>   <chr>   <chr>    <chr>    <chr>  
#>  1 CDISCPILOT01 DM     01-701-… 1015   2014-0… 2014-0… 2014-01… 2014-07… NA     
#>  2 CDISCPILOT01 DM     01-701-… 1023   2012-0… 2012-0… 2012-08… 2012-09… NA     
#>  3 CDISCPILOT01 DM     01-701-… 1028   2013-0… 2014-0… 2013-07… 2014-01… NA     
#>  4 CDISCPILOT01 DM     01-701-… 1033   2014-0… 2014-0… 2014-03… 2014-03… NA     
#>  5 CDISCPILOT01 DM     01-701-… 1034   2014-0… 2014-1… 2014-07… 2014-12… NA     
#>  6 CDISCPILOT01 DM     01-701-… 1047   2013-0… 2013-0… 2013-02… 2013-03… NA     
#>  7 CDISCPILOT01 DM     01-701-… 1057   NA      NA      NA       NA       NA     
#>  8 CDISCPILOT01 DM     01-701-… 1097   2014-0… 2014-0… 2014-01… 2014-07… NA     
#>  9 CDISCPILOT01 DM     01-701-… 1111   2012-0… 2012-0… 2012-09… 2012-09… NA     
#> 10 CDISCPILOT01 DM     01-701-… 1115   2012-1… 2013-0… 2012-11… 2013-01… NA     
#> # ℹ 296 more rows
#> # ℹ 17 more variables: RFPENDTC <chr>, DTHDTC <chr>, DTHFL <chr>, SITEID <chr>,
#> #   AGE <dbl>, AGEU <chr>, SEX <chr>, RACE <chr>, ETHNIC <chr>, ARMCD <chr>,
#> #   ARM <chr>, ACTARMCD <chr>, ACTARM <chr>, COUNTRY <chr>, DMDTC <chr>,
#> #   DMDY <dbl>, tmp_var_1 <lgl>