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Pure curiosity
2 messages · Robert, Michael Bedward
Just to follow up on Robert's comment, If you do an ls() you'll see that you've created objects V1, V2 in your global environment. A very similar question was discussed last week (I think... it's all a blur) in the context of using "<-" instead of "=" with named function arguments. Michael
On 13 December 2010 14:10, robert denham <rjadenham at gmail.com> wrote:
On Mon, Dec 13, 2010 at 1:09 PM, robert denham <rjadenham at gmail.com> wrote:
in test <- data.frame(V1=c(1,2,3), V2=c(4,5,6)) you are using arguments to the data.frame function in the tag=value format. From the help: ? ?...: these arguments are of either the form ?value? or ?tag = ? ? ? ? ? value?. ?Component names are created based on the tag (if ? ? ? ? ? present) or the deparsed argument itself. in test <- data.frame(V1<-c(1,2,3), V2<-c(4,5,6)) you are using the value part, with the values being c(1,2,3) and c(4,5,6). Someone might explain whats really going on, but I don't think the assignment of c(1,2,3) to the variable V1 is done before the data.frame is evaluated. On Mon, Dec 13, 2010 at 12:53 PM, Matt Cooper <mattcstats at gmail.com>wrote:
Pure curiosity but does anyone know why '<-' and '=' generate different columning headers?
test <- data.frame(V1=c(1,2,3), V2=c(4,5,6)) test
?V1 V2 1 ?1 ?4 2 ?2 ?5 3 ?3 ?6
test <- data.frame(V1<-c(1,2,3), V2<-c(4,5,6)) test
?V1....c.1..2..3. V2....c.4..5..6. 1 ? ? ? ? ? ? ? ?1 ? ? ? ? ? ? ? ?4 2 ? ? ? ? ? ? ? ?2 ? ? ? ? ? ? ? ?5 3 ? ? ? ? ? ? ? ?3 ? ? ? ? ? ? ? ?6
names(test)
[1] "V1....c.1..2..3." "V2....c.4..5..6." ? ? ? ?[[alternative HTML version deleted]]
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