Description Usage Arguments Value Examples
The function fars_read_years is used to take the year as an input and create a filename using make_filename function. The file is then read using the fars_read function. If the year is invalid it returns an error message
1 | fars_read_years(years)
|
years |
takes a year as input,creates a filename, reads the information, adds a column for year then subsets the information, validates if there is an error and appropriately displays a warning message if an error occurs else returns "NULL" |
If an error is generated a warning message "invalid year: " with the invalid year information is displayed. If no error is generated it displays "NULL"
1 2 | fars_read_years(2013)
fars_read_years(2014)
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