Translate DT Column names to numeric indices using regex matching

Translate DT Column names to numeric indices using regex matching

Usage

which_cols(x, .data)

Arguments

x

chr/num Column numbers or names

Value

num Numeric representation of column

Examples

names(mtcars)
#>  [1] "mpg"  "cyl"  "disp" "hp"   "drat" "wt"   "qsec" "vs"   "am"   "gear"
#> [11] "carb"
which_cols("c", mtcars)
#> [1]  2  7 11