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

[Ravi Jeyaraman]

How about something like this?

df <- data.frame(ID=1:3, DTVAL=c("2009-03-21","2010-05-11","2020-05-05"))

df <- df %>% mutate(YEAR = as.numeric(format(as.Date(DTVAL,'%Y-%m-%d'),
'%Y')))



-----Original Message-----
From: R-help [mailto:r-help-bounces using r-project.org] On Behalf Of Charles Thuo
Sent: Friday, June 05, 2020 12:18 AM
To: r-help using r-project.org
Subject: [R] how to add a calculated column into a data frame

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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