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Assigning to a vector while keeping the attributes

David Winsemius 
Not sure what "a" really is. It's not a vector or a list according to  
the R interpreter.

 > a <- structure(1:3,x=3)
 > mode(a)
[1] "numeric"
 > is.vector(a)
[1] FALSE
 > is.list(a)
[1] FALSE

Experimentation shows that simple indexing provides the functionality  
you request while append does not.

 > a[4] <- 10
 > a
[1]  1  2  3 10
attr(,"x")
[1] 3


 > a <-append(a, 20)
 > a
[1]  1  2  3 10 20

# appears to have now coerced it to a vector
 > a
[1]  1  2  3 10 20
 > is.vector(a)
[1] TRUE

Thread (3 messages)

Alon Wasserman Assigning to a vector while keeping the attributes Feb 9 David Winsemius Assigning to a vector while keeping the attributes Feb 9 Gabor Grothendieck Assigning to a vector while keeping the attributes Feb 9