[R] Join data frame columns
gunter.berton at gene.com
Tue Oct 23 16:23:10 CEST 2012
I don't think so. The OP wanted the list by columns, not rows, if I
provides this. Of course, the request probably does not makes sense in
the first place, as the different types/classes in the data.frame will
be coerced to one type/class. Moreover, factors will become numeric
(is this what motivated the original request??):
> dat <- data.frame(a = 1:3, b=letters[1:3])
1 1 a
2 2 b
3 3 c
a1 a2 a3 b1 b2 b3
1 2 3 1 2 3
So, a guess would be that the OP wants:
a1 a2 a3 b1 b2 b3
"1" "2" "3" "a" "b" "c"
But without the requested reproducible example, this is only a guess.
Again, note the coercion of numerics to character.
I would also guess that the OP might benefit by reading the Intro to R
tutorial and the data frame section of the R Language Definition
Manual -- and perhaps ?data.frame -- to better understand the nature
of data frames and what can and cannot be done with them.
Of course, I may have missed the mark altogether, in which case, please ignore.
On Tue, Oct 23, 2012 at 6:48 AM, Rui Barradas <ruipbarradas at sapo.pt> wrote:
> Use apply/paste.
> apply(df, 1, paste, collapse = "") # outputs a vector
> Also, df is the name of an R function, you should choose something else, it
> can become confusing.
> Hope this helps,
> Rui Barradas
> Em 23-10-2012 12:45, brunosm escreveu:
>> I have a data frame with 100 variables (numeric and non numeric types),
>> I want to join them in only one column, like a vector, but i want to keep
>> the non numeric variables like they are.
>> I know that i can do something like this:
>> Suppose that my data is in df variable
>> This works but i have 100 variables!
>> Any way of doing this a little bit faster?
>> Thanks a lot!
>> View this message in context:
>> Sent from the R help mailing list archive at Nabble.com.
>> R-help at r-project.org mailing list
>> PLEASE do read the posting guide
>> and provide commented, minimal, self-contained, reproducible code.
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Genentech Nonclinical Biostatistics
Internal Contact Info:
More information about the R-help