I have a data frame (myframe) with variables (columns) A,B,C and 100 records

(rows) for each. Column A is numeric. I would like to append a column to

myframe that subtracts the value in row 24 of A from row 1 of A. In this

procedure the first 23 rows of the new column will necessarily be blank

(NA). Can anyone provide guidance for me here?

Thanks in advance for your time.

Nick

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