[R] Using transform to add a date column to a dataframe

[Tom La Bone]

Gavin Simpson wrote:
> 
> 
> It says that the two arguments have different numbers of observations.
> The reason for which should now be pretty obvious as you provided a
> single Date whereas airquality has 153 observations.
> 


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?


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