Check if a data frame has columns that we might overwrite

Helper function for other functions in the package that create new columns in a data frame, to check if the columns are already present in the data frame.

Usage

check_if_overwrite_columns(df, newcols, overwrite)

Arguments

df

Data frame

newcols

Names of the columns, as strings

overwrite

TRUE or FALSE to overwrite the columns

Details

Produces a warning if the columns are present but overwrite is true, and an error if overwrite is false.

Examples

if (FALSE) { # \dontrun{
df <- data.frame(a=c(1,2,3), b=c(1,2,3))

# this should give a warning
check_if_overwrite_columns(df, c('a', 'd'), overwrite=TRUE)
} # }