Now you are almost ready to finish. Add column names to the matrix, including one called day. Also, add a column with the month. Call the resulting object dat. Finally, make sure the day is an integer...

Now you are almost ready to finish. Add column names to the matrix, including one called day. Also, add a column with the month. Call the resulting object dat. Finally, make sure the day is an integer not a character. Hint: use only the first five columns.

Now that we have wrangled this data step-by-step, put it all together in one R chunk, using the pipe as much as possible. Hint: first define the indexes, then write one line of code that does all the string processing.