Re: [R] Problem with expand.grid

Prof Brian Ripley Tue, 22 Dec 2009 08:28:43 -0800

1) Look at the help: a data frame may be a list, but do pass a listsuch as unclass(dDF) when it says 'list'.

2) You have 7 columns of 10 items, which gives 10 million rows. Isthat really what you want (especially as some of the columns areconstant)? It's an object of ca 500MB.


On Tue, 22 Dec 2009, Keith Jewell wrote:

Hi All,

This example code
----------------
dDF <- structure(list(y = c(4.75587, 4.8451, 5.04139, 4.85733, 5.20412,
5.92428, 5.69897, 4.78958, 4, 4), t = c(0, 48, 144, 192, 240,
312, 360, 0, 48, 144), Batch = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1
), T = c(2, 2, 2, 2, 2, 2, 2, 2, 2, 2), pH = c(4.6, 4.6, 4.6,
4.6, 4.6, 4.6, 4.6, 4.6, 4.6, 4.6), S = c(0, 0, 0, 0, 0, 0, 0,
0, 0, 0), N = c(0, 0, 0, 0, 0, 0, 0, 80, 80, 80)), .Names = c("y",
"t", "Batch", "T", "pH", "S", "N"), row.names = c(NA, 10L), class =
"data.frame")
str(dDF)
expand.grid(dDF)
------------------------------------
'hangs' for a while and then gives an error

Error in `[[<-.data.frame`(`*tmp*`, i, value = c(4.75587, 4.8451, 5.04139,
:
 replacement has 10000000 rows, data has 10

In NEWS.R-2.11.0dev I read:
   o    The new (in 2.9.0) 'stringsAsFactors' argument to expand.grid()
        was not working: it now does work but has default TRUE for
        backwards compatibility.

but I don't think that's relevant, I have no factors.

I'm probably being silly. Can anyone point out where?

Best...

Keith Jewell

--please do not edit the information below--

Version:
platform = i386-pc-mingw32
arch = i386
os = mingw32
system = i386, mingw32
status = Patched
major = 2
minor = 10.1
year = 2009
month = 12
day = 21
svn rev = 50796
language = R
version.string = R version 2.10.1 Patched (2009-12-21 r50796)

Windows Server 2003 x64 (build 3790) Service Pack 2

Locale:
LC_COLLATE=English_United Kingdom.1252;LC_CTYPE=English_United
Kingdom.1252;LC_MONETARY=English_United
Kingdom.1252;LC_NUMERIC=C;LC_TIME=English_United Kingdom.1252

Search Path:
.GlobalEnv, package:stats, package:graphics, package:grDevices,
package:utils, package:datasets, package:methods, Autoloads, package:base

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--
Brian D. Ripley,                  rip...@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Re: [R] Problem with expand.grid

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