R help - Jan 2002 - R 1.4.0 much slower than R 1.3.1

Dear R-ers

I've recently upgraded to R-1.4 but I have noticed that it is slower
to load datasets than R-1.3.1:

R-1.3.1:
> system.time(a <-
read.table("~/people/academics/mitchell/nzsl02.27",header=T))
[1] 40.86  0.51 54.10  0.00  0.00
> 

R-1.4.0:
> system.time(a <-
read.table("~/people/academics/mitchell/nzsl02.27",header=T))
[1] 293.24  30.76 478.35   0.00   0.00


The dataset in question is big ( 75306 x 27) but not desperately so.
Am I doing something stupid here?



-- 

Robin Hankin, Lecturer,
School of Environmental and Marine Science
Private Bag 92019 Auckland
New Zealand

r.hankin at auckland.ac.nz
tel 0064-9-373-7599 x6820; FAX 0064-9-373-7042

as of: Thu Jan 17 13:10:00 NZDT 2002
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On Thu, 17 Jan 2002, Robin Hankin wrote:
> Dear R-ers
>
> I've recently upgraded to R-1.4 but I have noticed that it is slower
> to load datasets than R-1.3.1:
>
Yes. It's a bug. It's fixed in R-patched.  It's already been asked
and
answered at least twice on this list in the last 48 hours.

	-thomas

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Robin Hankin <r.hankin at auckland.ac.nz> writes:
> R-1.3.1:
> > system.time(a <-
read.table("~/people/academics/mitchell/nzsl02.27",header=T))
> [1] 40.86  0.51 54.10  0.00  0.00
> R-1.4.0:
> > system.time(a <-
read.table("~/people/academics/mitchell/nzsl02.27",header=T))
> [1] 293.24  30.76 478.35   0.00   0.00
> 
> The dataset in question is big ( 75306 x 27) but not desperately so.
> Am I doing something stupid here?
No. R is. This has been reported before and should be fixed in the
current patch set.

A temporary fix would seem to be to make sure that while (nlines < 5)
loop near the start of read.table actually increments nlines in its
body...

-- 
   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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