grab column names for subsetting crdfs
Take a character, logical, or integer vector and return the appropriate names
of the crdf to subset. Disallow logicals (in the case of [[ subsetting, to
conform with data.frame methods)
grabColNames(x, j, allow_logical = TRUE)
x |
crdf to grab columns from |
j |
character, logical, or integer vector specifying the columns to grab |
allow_logical |
logical should logical subsetting be allowed? (default: TRUE) |
character names of the columns of the crdf to select
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