[R] How to perform arithmetic across rows

[Nick Ackerman]

Hi All,

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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