R help - Jul 2004 - add more data to a data file, problem with .Rprofile

Hi,

Is there a way to incorporate an R object x to a file already containing R
objects?
It seems that 'save' is not capable to do this. If I save x to a file
containing
previously saved data, then I will lose this data.

I use the funcion hsv in .Rprofile but it is recognized. Couriously, if I source
.Rprofile
when R is already running I do not get any error message. 

Thank you.

> From: Francisco J Molina
> 
> Hi,
> 
> Is there a way to incorporate an R object x to a file already 
> containing R objects?
> It seems that 'save' is not capable to do this. If I save x 
> to a file containing
> previously saved data, then I will lose this data.
See if the following helps:
> x <- 2
> save(x, file="x.rda")
> rm(x)
> attach("x.rda")
> assign("y", 3, pos=2)
> ls(2)
[1] "x" "y"
> save(list=ls(2), file="x.rda")
> detach(2)
> x
Error: Object "x" not found
> y
Error: Object "y" not found
> attach("x.rda")
> x
[1] 2
> y
[1] 3
> ls(2)
[1] "x" "y"

 
> I use the funcion hsv in .Rprofile but it is recognized. 
> Couriously, if I source .Rprofile
> when R is already running I do not get any error message. 
Not sure what you mean...

Andy
 
> Thank you.
> 
> ______________________________________________
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> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
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> 
>

You should take a look at ?setHook if you use hsv() in .Rprofile. 
That way when the `graphics' package is loaded, it will automatically 
run whatever hook function you specified involving hsv().  For 
example, you might include something like

setHook(packageEvent("graphics", "onLoad"),
	function(...) {
		hsv <- graphics::hsv
		## Do whatever you need to do with hsv()
	})

-roger

Francisco J Molina wrote:
> Hi,
> 
> Is there a way to incorporate an R object x to a file already
> containing R objects? It seems that 'save' is not capable to do
> this. If I save x to a file containing previously saved data, then
> I will lose this data.
> 
> I use the funcion hsv in .Rprofile but it is recognized.
> Couriously, if I source .Rprofile when R is already running I do
> not get any error message.
> 
> Thank you.
> 
> ______________________________________________ 
> R-help at stat.math.ethz.ch mailing list 
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do
> read the posting guide! http://www.R-project.org/posting-guide.html
> 
>