R help - Oct 2009 - ozone data

Hi just a quick inquiry

Sorry if this is too trivial but I am just a beginner in R.

I am looking at the plyr package and I am intrigued at how data(i.e. ozone,
baseball) is loaded without having to type data(ozone). Are they automatically
loaded when i call library(plyr)? I want to do the same thing when I make my
package. How does one accomplish this?

Also, are there any beginner guides on how to make a package?

Thank you all..

Cheers,

Julius TEsoro

On 10/17/09, Julius Tesoro <jutesoro at yahoo.com>
wrote:
>  I am looking at the plyr package and I am intrigued at how data(i.e.
ozone, baseball) is loaded without having to type data(ozone). Are they
automatically loaded when i call library(plyr)? I want to do the same thing when
I make my package. How does one accomplish this?
>
I don't know how this is achieved, but try looking at the source code
for the package.

>  Also, are there any beginner guides on how to make a package?
>
I would not call this a beginner's guide, but here's the standard
reference [1]. This is what I wrote some time ago in an off-list
message:
"When I published my first (and still only) R package I also found it
daunting to get it working. Perhaps the easiest way to get it
going---at least it worked for me---would be to:
- take the source archive of an existing package with a
very-simple-structure (nortest or even Rcmdr) or a package that would
be very similar to what you need [consider the potential licence issues, though]
- get rid of/replace files as needed
- not forget to run R CMD check (to check that the code conforms to
CRAN requirements) and R CMD build (to build the release tarball)
- then what rests to do is drop the latter on the CRAN FTP server."

It's been some time that I did this, so there might be some missing
step. Hope this is of help. Best,
Liviu

[1] http://cran.r-project.org/doc/manuals/R-exts.pdf

On 10/17/09, Julius Tesoro <jutesoro at yahoo.com>
wrote:
> wow thanks but how do i load data just by typing ozone on the console?
>
It would probably suffice to include the dataset as an object in your
package, and then `data(ozone)' should bring it up as soon as your
package is loaded. Look at the source code of any package offering
such data set (there are plenty built-in data sets: Angell, iris,
maryo, mtcars, etc., etc.). You can use rseek or package(sos) to
pinpoint the exact files of interest.
Liviu