[Rd] cannot allocate vector of size in merge (PR#765)

[Peter Dalgaard BSA]

Viktor Moravetski <viktorm@pdf.com> writes:

> Hi Saikat,
> Yes, I don't need to specify nsize and vsize for version 1.2.0. 
> But error is the same, even if start R with default parameters. 
> It grows in memory and then gives an error. 
> See output below:
> > gc()
>           used (Mb) gc trigger (Mb)
> Ncells  358534  9.6     597831 16.0
> Vcells 3330352 25.5    3736477 28.6
> > df <- data.frame(x=1:30000,y=2,z=3)
> > merge(df,df)
> Error: cannot allocate vector of size 3515625 Kb

I think you're just experiencing the fact that the merge() function in
R is not implemented very efficiently (to say the least). For many
practical purposes, this can be worked around using e.g. match().

Contributions are welcome...

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