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

[Viktor Moravetski]

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
> 


Saikat DebRoy wrote:
> 
> >>>>> "viktorm" == viktorm  <viktorm@pdf.com> writes:
> 
>   viktorm> Full_Name: Viktor Moravetski
>   viktorm> Version: Version 1.2.0 (2000-12-13)
>   viktorm> OS: Win-NT 4.0 SP5
>   viktorm> Submission from: (NULL) (209.128.81.199)
> 
>   viktorm> I've started R (v.1.20) with command:
>   viktorm> rgui --vsize 450M --nsize 40M
> 
>   viktorm> Then at the command prompt:
>   >> gc()
>   viktorm>           used (Mb) gc trigger (Mb)
>   viktorm> Ncells  358534  9.6   41943040 1120
>   viktorm> Vcells 3469306 26.5   58982400  450
> 
>   >> df <- data.frame(x=1:30000,y=2,z=3)
>   >> merge(df,df)
>   viktorm> Error: vector memory exhausted (limit reached?)
> 
> Do you really need such a large number of Ncells ? I think not. Try
> starting R without specifying --nsize (and maybe even --vsize). In
> 1.2.0, R would  automatically allocate more memory if the intial value
> is not enough. But (as far as I know) it would not decrease the amount
> of memory below the initial amount.
> 
>   viktorm> In S-Plus it worked fine, no problems.
>   viktorm> It looks like that "R" cannot merge dataframes with
>   viktorm> more than 30K rows. It has enough memory, so what limit
>   viktorm> was reached and what should I do?

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