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Using transform to add a date column to a dataframe

Tom La Bone
Gavin Simpson wrote:
Thanks. I did look at ?transform but I was a bit confused because this
worked

   data1 <- transform(airquality,LTMDA=T)

whereas this did not

  data1 <- transform(airquality,Date=as.Date("1950-01-01"))

Why does the first one work with one argument but the second one does not?

Thread (7 messages)

Tom La Bone Using transform to add a date column to a dataframe Dec 23 Gavin Simpson Using transform to add a date column to a dataframe Dec 23 Gabor Grothendieck Using transform to add a date column to a dataframe Dec 23 Philipp Pagel Using transform to add a date column to a dataframe Dec 23 Tom La Bone Using transform to add a date column to a dataframe Dec 23 Brian Ripley Using transform to add a date column to a dataframe Dec 23 Peter Dalgaard Using transform to add a date column to a dataframe Dec 23