This convenience function performs a set difference between
the columns of
.DF and the variable names (or symbols) given in
The return value is a list of symbols.
a data frame whose variable names are to be differenced
a string, strings, vector of strings, or list of strings representing column names to be subtracted from the names of
a boolean that defines the return type:
a vector of symbols (when
symbols = TRUE) or strings (when
symbol = FALSE) containing all variables names except those given in
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