[R] features of save and save.image (unexpected file sizes)

[Vaidotas Zemlys]

Hi,

On 2/2/07, Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote:

> > I found the culprit. I was parsing formulas in my code, and I saved
> > them in that large object. So the environment came with saved
> > formulas. Is there a nice way to say R: "please do not save the
> > environments with the formulas, I do not need them?"
>
> No, but why create them that way?  You could do
>
> mmodel <- as.formula(mmodel, env=.GlobalEnv)
>
Hm, but say I have some large object in .GlobalEnv, and I generate
mmodel  10 different times and save the result as a list with length
10. Now if I try to save this list, R will save 10 different copies of
.GlobalEnv together with aforementioned large object?

> The R way is to create what you want, not fix up afterwards.
>
> (I find your code unreadable--spaces help a great deal, so am not sure if
> I have understood it correctly.)
>
Hm, I copied this code directly from Emacs+ESS, maybe the mailer
mangled something. What I want to do with this piece of code (I will
repaste it here)

testf<- function(formula) {
    mainform <- formula
    if(deparse(mainform[[3]][[1]])!="|") stop("invalid conditioning")
    mmodel <- substitute(y~x,list(y=mainform[[2]],x=mainform[[3]][[2]]))
    mmodel <- as.formula(mmodel)
    list(formula=list(main=mmodel))
}

is to read formula with condition:

formula(y~x|z)

and construct formula

formula(y~x)

I looked for examples in code of coplot in library graphics and
latticeParseFormula in library lattice.

Vaidotas Zemlys
--
Doctorate student, http://www.mif.vu.lt/katedros/eka/katedra/zemlys.php
Vilnius University