[R] Problem with expand.grid

[Prof Brian Ripley]

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

2) You have 7 columns of 10 items, which gives 10 million rows.  Is 
that really what you want (especially as some of the columns are 
constant)?  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
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Brian D. Ripley,                  ripley at 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