R devel - Mar 2011 - datalist and data objects in R Package building

Hello all,

I have,say 4 R objects...  bar1, bar2, bar3, bar4.. that I'd like to include
in an R package "foobar".

The desired functionality would be:
> library(foobar)
> data(foo)
> ls()
[1] "bar1" "bar2" "bar3" "bar4"

I've tried the following two approaches:

1) I created the file 'datalist' under pre-build directory
'foobar/data/'
with the following contents:
foo: bar1 bar2 bar3 bar4

After package build and install, "data(foo)" reports that data set
'foo' not
found (bar1, bar2, etc are all available individually, and are listed under
data() as "bar1 (foo)".

2) I created an image via save.image resulting in foo.rda (containing bar1,
bar2, etc).

data(foo) now loads bar1 - bar4, but 'foo' doesn't appear in the
list of
available datasets displayed when trying to tab complete within data().


So my question is, what's the correct approach for what I'm trying to do
here?  Any advice welcome and appreciated.

Thanks,
Andrew

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On 24.03.2011 16:51, andrew stewart wrote:
> Hello all,
>
> I have,say 4 R objects...  bar1, bar2, bar3, bar4.. that I'd like to
include
> in an R package "foobar".
>
> The desired functionality would be:
>
>> library(foobar)
>> data(foo)
>> ls()
> [1] "bar1" "bar2" "bar3" "bar4"
>
> I've tried the following two approaches:
>
> 1) I created the file 'datalist' under pre-build directory
'foobar/data/'
> with the following contents:
> foo: bar1 bar2 bar3 bar4
>
> After package build and install, "data(foo)" reports that data
set 'foo' not
> found (bar1, bar2, etc are all available individually, and are listed under
> data() as "bar1 (foo)".

If you want just one object "foo", then prpare a list

foo <- list(bar1,...)

that contains the 4 objects bar1, ... .
You can load that objects and access the list components afterwards.

I think you misunderstood the data concept: You can save objects and 
load them if the package is installed. That's it.

Best,
Uwe Ligges


> 2) I created an image via save.image resulting in foo.rda (containing bar1,
> bar2, etc).
>
> data(foo) now loads bar1 - bar4, but 'foo' doesn't appear in
the list of
> available datasets displayed when trying to tab complete within data().
>
>
> So my question is, what's the correct approach for what I'm trying
to do
> here?  Any advice welcome and appreciated.
>
> Thanks,
> Andrew
>
> 	[[alternative HTML version deleted]]
>
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