[R] plot xaxp issue

[Elaine Kuo]

Hello,

I figured out that the code should be

boyline<-lm(body_weight ~ body_length, data=subset (together,,sex=="boy"))

However, the "" could be omitted if the field name happened to be
numeric, such as 1, 2, or 3.
Please kindly explain why the "" could be omitted for numbers.
Thanks again.

Elaine
On Tue, Jan 8, 2013 at 8:40 AM, Elaine Kuo <elaine.kuo.tw at gmail.com> wrote:
> boyline<-lm(body_weight ~ body_length, data=together, subset(together,sex=="boy"))