[R] Use a list to 'transport' a collection of data sets and results

[David Winsemius]

On Jul 27, 2011, at 6:27 AM, christiaan pauw wrote:

> Hi Everybody
>
> I need to "transport" some data and results to use another application
> (Sweave via LyX - where debugging is very difficult) in order to  
> build a
> report.
>
> Is it possible to store a collection of variables of different types  
> (like
> named integers, matricies, data frames and two lists) all in one  
> list and
> save it and then simply load it again later and "unpack" the  
> variables.

The usual method is to use the 'save' function and then restore or  
recover objects with the 'load' function.

You could I suppose add an additional (needless) layer of making a  
list , saving, loading,  and then "assign'-ing values to 'names' of  
that list.

-- 
David.

>
> Thanks is advance
> Christiaan
>
> Please see the sample code below.
>
> # Create variables of different types
>
> x=expand.grid(1:4,letters[1:4])
>
> y=matrix(1:1000,ncol=20)
>
> z=list(a=1,b=2:20,c=matrix(1:50,ncol=5))
>
> result.one=1
>
> names(result.one)="first result"
>
> result.two=2
>
> names(result.one)="second result"
>
>
> # Put them all in list
>
> allvars=list(x,y,z,result.one,result.two)
>
> names(allvars)=c("x","y","z","result.one","result.two")
>
> ls()
>
> [1] "allvars"    "result.one" "result.two" "x"          "y"           
> "z"
>
> # Save it
>
> save(allvars,file="allvars.Rda")
> # Now remove it with rm(allvars) and load it again :
>
> load("allvars.Rda")
>
> What I need here is the magic function that will 'unpack" the list  
> and give
> the same results to ls()
> ls()
>
> 	[[alternative HTML version deleted]]
>
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David Winsemius, MD
West Hartford, CT