| make_columns_numeric | R Documentation | 
Take a data frame and add numeric versions of specified factor columns
make_columns_numeric(df, cols, fun = as.numeric, ...)
| df | The data.frame with the source data | 
| cols | A list of column names to convert | 
| fun | The function to apply to all of the columns | 
| ... | Additional parameters to fun | 
A new data frame with additional columns.  Each column listed in cols will have
a new version added, column_n, containing the data data as in column convert to numeric
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