[R] Object size in bytes

[Peter Dalgaard BSA]

Nicholas Lewin-Koh <kohnicho at comp.nus.edu.sg> writes:

> Hi,
> Is there a command that will give the total size of an R object in bytes?

No. You can get some of the way with

function (it) 
{
    x1 <- gc()[, 1]
    copy <- it
    x2 <- gc()[, 1]
    x1 - x2 - c(5, 6) # correct for variables and function call (fudged)
}

> x<-rnorm(20000)
> sizeit(x)
Ncells Vcells 
     1  20000 
> names(x)<-1:20000
> sizeit(x)
Ncells Vcells 
     3  30001 

And from there on things become system dependent. On x386 (Linux and
also Windows IIRC) an Ncell is 20 bytes and a Vcell is 8.

Oddly enough, this doesn't seem to work for functions, and I haven't
got a clue why at the moment:

> sizeit(glm.fit)
Ncells Vcells 
     1     -1 


-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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