[R] questions on some operators in R
dwinsemius at comcast.net
Thu Jun 17 00:55:12 CEST 2010
On Jun 16, 2010, at 6:33 PM, li li wrote:
> Hi all,
> I have two questions. Can some one give some help?
> The first question is regarding the pair of operators "&" and
> "&&". What
> is the
> difference between the two?
& operates on vectors, returns a vector
&& operates on the first item in each argument. Retruns a value and a
warning if either of the arguments of of length > 1.
> The second question is regarding "<-" and "=". Usually we use
> "<-" as the assignment operator. I saw some people use "=". Is there
> any difference between the two.
Yes. Many discussions in the archives. will be more erudite and
accurate than mine. "=" is preferred for assigning values in argument
lists. "<-" is preferred for assignment to objects. Generally the
differences do not matter but there are exceptions.
More information about the R-help