[R] size of a glm-like object

[vito muggeo]

Dear all,
I'm writing a package where the main function fn(), say, returns a glm-like
object, with three additional components.
> obj<-glm(....)
> out<-fn(obj,....)
out is substantially an updated version of obj, with the same response and
some (two or three) additional variables in the linear predictor.
My problem is that out is much bigger than obj, and the three additional
components don't seem responsible, as they are quite small.

> class(obj)
[1] "glm" "lm"
> class(out)
[1] "myclass" "glm"       "lm"

> object.size(obj)
[1] 1685228
> object.size(out)
[1] 2701292

Why is out so larger than obj? the additional components are rather small
and the remaining ones seem approximatevely the same.
Many thanks,
vito

#the size of the additional components:
> object.size(out$psi)
[1] 348
> object.size(out$it)
[1] 36
> object.size(out$epsilon)
[1] 36

#the size of some remaining component:
> all.equal(out$y,obj$y)
[1] TRUE

> object.size(obj$R)
[1] 9284
> object.size(out$R)
[1] 10356

> object.size(obj$coef)
[1] 1024
> object.size(out$coef)
[1] 1064

> object.size(obj$call)
[1] 1456
> object.size(out$call)
[1] 764


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