[R] how to add a calculated column into a data frame

Charles Thuo tcmu|g@| @end|ng |rom gm@||@com
Fri Jun 5 06:18:00 CEST 2020

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Dear  Sirs,

I have a data frame that has a column that shows the transaction date.

How do i add another column that  extracts the year of transaction from the
transaction date.

Charles

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