Thanks. I also noticed myself minutes after sending my message to the
list. My 'please ignore my question it was just a stupid typo' message
was sent with the wrong account and is now awaiting moderation.
However, my other question still stands: what is the
preferred/fastest/simplest way to create a data.fame with given column
types and dimensions?
Regards,
Jan
On 05/15/2011 04:43 PM, Bert Gunter wrote:
In your post, you're missing the final "s" on the stringsAsFactors
argument in the d1 assignment. When I typed it correctly, it works as
expected.
-- Bert
On Sun, May 15, 2011 at 4:25 AM, Jan van der Laan<rh...@eoos.dds.nl> wrote:
I use the following code to create two data.frames d1 and d2 from a list:
types<- c("integer", "character", "double")
nlines<- 10
d1<- as.data.frame(lapply(types, do.call, list(nlines)),
stringsAsFactor=FALSE)
l2<- lapply(types, do.call, list(nlines))
d2<- as.data.frame(l2, stringsAsFactors=FALSE)
I would expect d1 and d2 to be the same, however, in d1 the second column is
a factor while in d2 it is a character (which I would expect):
str(d1)
'data.frame': 10 obs. of 3 variables:
$ c.0L..0L..0L..0L..0L..0L..0L..0L..0L..0L.: int 0 0 0 0 0 0 0 0 0 0
$ c........................................: Factor w/ 1 level "": 1 1 1 1
1 1 1 1 1 1
$ c.0..0..0..0..0..0..0..0..0..0. : num 0 0 0 0 0 0 0 0 0 0
str(d2)
'data.frame': 10 obs. of 3 variables:
$ c.0L..0L..0L..0L..0L..0L..0L..0L..0L..0L.: int 0 0 0 0 0 0 0 0 0 0
$ c........................................: chr "" "" "" "" ...
$ c.0..0..0..0..0..0..0..0..0..0. : num 0 0 0 0 0 0 0 0 0 0
As different but related question: I use the commands above to create an
'empty' data.frame with specified column types and dimensions. I need this
data.frame to pass on to my c++ routines. Is there a more simple/elegant way
of creating this data.frame?
Regards,
Jan
PS:
I am running R on 64 bit Ubuntu 11.04:
sessionInfo()
R version 2.12.1 (2010-12-16)
Platform: x86_64-pc-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=C LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
______________________________________________
R-help@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.
______________________________________________
R-help@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.
