>>>>> "Gabor" == Gabor Grothendieck <[EMAIL PROTECTED]>
>>>>> on Mon, 7 Feb 2005 04:39:40 +0000 (UTC) writes:
Adrian Baddeley <adrian <at> maths.uwa.edu.au> writes:
: I want to equip a data frame with an attribute
: which specifies how to plot some of the columns.
:
: Up to now we have been doing this by giving the data frame
: a `formula' attribute, that can be passed to plot.formula.
:
: For example
: dat <- data.frame(x=1:100,y=runif(100),z=100:1)
: attr(dat, "plotme") <- (z ~ x)
: ......
: ......
: if(missing(desiredformula))
: desiredformula <- attr(dat, "plotme")
: plot(desiredformula, data=dat)
:
: We just got bitten by the fact that a formula object has a `.Environment'
: attribute, which may be huge, depending on the environment
: in which the formula was created. In the example above there is
: no upper limit on the size of the object 'dat' !!!!
: That is, environment(attr(dat, "plotme")) could be huge.
Gabor> Do you mean that if fo is the formula then ls(environment(fo))
Gabor> has many large components? I don't understand why that would
Gabor> be a problem.
maybe Adrian save()s that data.frame susequently?
Then, I assume the environment will copied.
In all(?) other circumstances that should only be a pointer and
not really use much memory.
Martin
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