Dear All,
to my surprise as.factor does not accept a levels argument. Maybe I
did not read the documentation well enough. See the example below. I
wanted to use ch1 as factor in the newdata argument of survfit, so I
assumed that I could write as.factor(ch1, levels=ch1), since the
order should be kept.
But as.factor(ch1, levels=ch1) results in the error:
Error in as.factor(ch1, levels = ch1) :
unused argument(s) (levels = c("low", "inter",
"high"))
factor(ch1, levels=ch1) works as I expected.
Is it intended that as.factor does not use the levels argument?
Thanks,
Heinz
ch1 <- c('low', 'inter', 'high')
factor(ch1)
factor(ch1, levels=ch1)
as.factor(ch1, levels=ch1)
> version
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status Patched
major 2
minor 8.1
year 2009
month 03
day 13
svn rev 48132
language R
version.string R version 2.8.1 Patched (2009-03-13 r48132)
> sessionInfo()
R version 2.8.1 Patched (2009-03-13 r48132)
i386-pc-mingw32
locale:
LC_COLLATE=German_Switzerland.1252;LC_CTYPE=German_Switzerland.1252;LC_MONETARY=German_Switzerland.1252;LC_NUMERIC=C;LC_TIME=German_Switzerland.1252
attached base packages:
[1] splines stats graphics grDevices utils datasets methods
[8] base
other attached packages:
[1] survival_2.34-1 car_1.2-12 gmodels_2.14.1 gdata_2.4.2
[5] Hmisc_3.5-2
loaded via a namespace (and not attached):
[1] cluster_1.11.12 grid_2.8.1 gtools_2.5.0-1 lattice_0.17-20
[5] MASS_7.2-46
>
as.factor does not accept levels as an argument. use the first form that you have factor(ch1, levels=ch1) On Wed, Apr 8, 2009 at 7:36 AM, Heinz Tuechler <tuechler at gmx.at> wrote:> Dear All, > > to my surprise as.factor does not accept a levels argument. Maybe I did not > read the documentation well enough. See the example below. I wanted to use > ch1 as factor in the newdata argument of survfit, so I assumed that I could > write as.factor(ch1, levels=ch1), since the order should be kept. > > But as.factor(ch1, levels=ch1) results in the error: > > Error in as.factor(ch1, levels = ch1) : > ?unused argument(s) (levels = c("low", "inter", "high")) > > factor(ch1, levels=ch1) works as I expected. > Is it intended that as.factor does not use the levels argument? > > Thanks, > > Heinz > > ch1 <- c('low', 'inter', 'high') > factor(ch1) > factor(ch1, levels=ch1) > as.factor(ch1, levels=ch1) > >> version > ? ? ? ? ? ? ? _ > platform ? ? ? i386-pc-mingw32 > arch ? ? ? ? ? i386 > os ? ? ? ? ? ? mingw32 > system ? ? ? ? i386, mingw32 > status ? ? ? ? Patched > major ? ? ? ? ?2 > minor ? ? ? ? ?8.1 > year ? ? ? ? ? 2009 > month ? ? ? ? ?03 > day ? ? ? ? ? ?13 > svn rev ? ? ? ?48132 > language ? ? ? R > version.string R version 2.8.1 Patched (2009-03-13 r48132) >> sessionInfo() > R version 2.8.1 Patched (2009-03-13 r48132) > i386-pc-mingw32 > > locale: > LC_COLLATE=German_Switzerland.1252;LC_CTYPE=German_Switzerland.1252;LC_MONETARY=German_Switzerland.1252;LC_NUMERIC=C;LC_TIME=German_Switzerland.1252 > > attached base packages: > [1] splines ? stats ? ? graphics ?grDevices utils ? ? datasets ?methods > [8] base > > other attached packages: > [1] survival_2.34-1 car_1.2-12 ? ? ?gmodels_2.14.1 ?gdata_2.4.2 > [5] Hmisc_3.5-2 > > loaded via a namespace (and not attached): > [1] cluster_1.11.12 grid_2.8.1 ? ? ?gtools_2.5.0-1 ?lattice_0.17-20 > [5] MASS_7.2-46 >> > > ______________________________________________ > 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. >-- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve?
It is just a simple version of 'factor'. The only speed advantage it might have is that it checks to see if it is a factor first. Here is the definition: )> as.factor function (x) if (is.factor(x)) x else factor(x) <environment: namespace:base> You can always list out what the function does to get a better understanding of how it works. On Wed, Apr 8, 2009 at 8:16 AM, Heinz Tuechler <tuechler at gmx.at> wrote:> Thank you, Jim. I see, the fact that in the documentation you find only > "as.factor(x)" means that it does not accept more arguments. > Does as.factor have speed advantages over factor, or is there a different > cause for it's existence? > > Heinz > > > > At 13:50 08.04.2009, jim holtman wrote: >> >> as.factor does not accept levels as an argument. ?use the first form >> that you have >> >> factor(ch1, levels=ch1) >> >> >> >> On Wed, Apr 8, 2009 at 7:36 AM, Heinz Tuechler <tuechler at gmx.at> wrote: >> > Dear All, >> > >> > to my surprise as.factor does not accept a levels argument. Maybe I did >> > not >> > read the documentation well enough. See the example below. I wanted to >> > use >> > ch1 as factor in the newdata argument of survfit, so I assumed that I >> > could >> > write as.factor(ch1, levels=ch1), since the order should be kept. >> > >> > But as.factor(ch1, levels=ch1) results in the error: >> > >> > Error in as.factor(ch1, levels = ch1) : >> > ?unused argument(s) (levels = c("low", "inter", "high")) >> > >> > factor(ch1, levels=ch1) works as I expected. >> > Is it intended that as.factor does not use the levels argument? >> > >> > Thanks, >> > >> > Heinz >> > >> > ch1 <- c('low', 'inter', 'high') >> > factor(ch1) >> > factor(ch1, levels=ch1) >> > as.factor(ch1, levels=ch1) >> > >> >> version >> > ? ? ? ? ? ? ? _ >> > platform ? ? ? i386-pc-mingw32 >> > arch ? ? ? ? ? i386 >> > os ? ? ? ? ? ? mingw32 >> > system ? ? ? ? i386, mingw32 >> > status ? ? ? ? Patched >> > major ? ? ? ? ?2 >> > minor ? ? ? ? ?8.1 >> > year ? ? ? ? ? 2009 >> > month ? ? ? ? ?03 >> > day ? ? ? ? ? ?13 >> > svn rev ? ? ? ?48132 >> > language ? ? ? R >> > version.string R version 2.8.1 Patched (2009-03-13 r48132) >> >> sessionInfo() >> > R version 2.8.1 Patched (2009-03-13 r48132) >> > i386-pc-mingw32 >> > >> > locale: >> > >> > LC_COLLATE=German_Switzerland.1252;LC_CTYPE=German_Switzerland.1252;LC_MONETARY=German_Switzerland.1252;LC_NUMERIC=C;LC_TIME=German_Switzerland.1252 >> > >> > attached base packages: >> > [1] splines ? stats ? ? graphics ?grDevices utils ? ? datasets ?methods >> > [8] base >> > >> > other attached packages: >> > [1] survival_2.34-1 car_1.2-12 ? ? ?gmodels_2.14.1 ?gdata_2.4.2 >> > [5] Hmisc_3.5-2 >> > >> > loaded via a namespace (and not attached): >> > [1] cluster_1.11.12 grid_2.8.1 ? ? ?gtools_2.5.0-1 ?lattice_0.17-20 >> > [5] MASS_7.2-46 >> >> >> > >> > ______________________________________________ >> > 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. >> > >> >> >> >> -- >> Jim Holtman >> Cincinnati, OH >> +1 513 646 9390 >> >> What is the problem that you are trying to solve? > > >-- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve?