On Feb 4, 2011, at 8:26 AM, Denis Kazakiewicz wrote:
Dear R people
Could you please help
I have similar but opposite question
How to reshape data from DF.new to DF from example, Mark kindly
provided?
Well, I don't think you want a random order, right? If what you are
asking is for a single character element per line of dataframe then
try this:
apply(df.new, 1, paste, collapse="_")
--
David.
Thank you
Denis
On Пят, 2011-02-04 at 07:09 -0600, Marc Schwartz wrote:
On Feb 4, 2011, at 6:32 AM, D. Alain wrote:
Dear R-List,
I have a dataframe with one column "name.of.report" containing
character values, e.g.
df$name.of.report
"jeff_2001_teamx"
"teamy_jeff_2002"
"robert_2002_teamz"
"mary_2002_teamz"
"2003_mary_teamy"
...
(i.e. the bit of interest is not always at same position)
Now I want to recode the column "name.of.report" into the
variables "person", "year","team", like this
new.df
"person" "year" "team"
jeff 2001 x
jeff 2002 y
robert 2002 z
mary 2002 z
I tried with grep()
df$person<-grep("jeff",df$name.of.report)
but of course it didn't exactly result in what I wanted to do.
Could not find any solution via RSeek. Excuse me if it is a very
silly question, but can anyone help me find a way out of this?
Thanks a lot
Alain
There will be several approaches, all largely involving the use of ?
regex. Here is one:
DF <- data.frame(name.of.report = c("jeff_2001_teamx",
"teamy_jeff_2002",
"robert_2002_teamz",
"mary_2002_teamz",
"2003_mary_teamy"))
DF
name.of.report
1 jeff_2001_teamx
2 teamy_jeff_2002
3 robert_2002_teamz
4 mary_2002_teamz
5 2003_mary_teamy
DF.new <- data.frame(person = gsub("[_0-9]|team.", "", DF
$name.of.report),
year = gsub(".*([0-9]{4}).*","\\1", DF
$name.of.report),
team = gsub(".*team(.).*","\\1", DF
$name.of.report))
DF.new
person year team
1 jeff 2001 x
2 jeff 2002 y
3 robert 2002 z
4 mary 2002 z
5 mary 2003 y
HTH,
Marc Schwartz
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______________________________________________
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.
David Winsemius, MD
West Hartford, CT
______________________________________________
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.
