[R] install R packages--sorry last letter that I sent I had an error, this one is the right one

[Martyn Plummer]

On Thu, 2005-05-19 at 10:09 -0400, Li, Jia wrote:
> Dear All,
>  
> When I tried to install R packages I found this error:
> > library(survival)
> Loading required package: splines

This is for your information. It is not an error message and is not
asking you to do anything (i.e. it says "loading" not "please load")

> > install.packages("splines")
> --- Please select a CRAN mirror for use in this session ---
> Warning message:
> package splines is in use and will not be installed 
> 
> But I just opened R, and haven't used anything yet, how come did it say "package splines is in use"?

Because it was loaded automatically when you loaded the splines package.
Have a look at the search path with 

search()

You have confused *installing* a package - putting it's files on your
disk - with *loading* it - making it's objects and help pages available
for use in an R session.

Martyn