[R] Transform values from one column into column names of new dataframe
Hi, I have a question about reformatting data. It looks like it should be simple, but I've been working at it for awhile now and it's about time I ask for help. My data look like this: ITEM VALUE STEP item1 A first item2 C first item2 D second item1 A second item3 A first item3 B second item3 A third I just want to transform it so they look like this: ITEM FIRST SECOND THIRD item1 A ANA item2 C DNA item3 A BA Basically taking the values of the STEP column and using those as the column names and merging together the items. I appreciate your help, -Matt __ 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.
Re: [R] Transform values from one column into column names of new dataframe
On Fri, May 2, 2008 at 11:05 AM, Matt [EMAIL PROTECTED] wrote: Hi, I have a question about reformatting data. It looks like it should be simple, but I've been working at it for awhile now and it's about time I ask for help. My data look like this: ITEM VALUE STEP item1 A first item2 C first item2 D second item1 A second item3 A first item3 B second item3 A third I just want to transform it so they look like this: ITEM FIRST SECOND THIRD item1 A ANA item2 C DNA item3 A BA Basically taking the values of the STEP column and using those as the column names and merging together the items. Have a look at the reshape package (http://had.co.nz/reshape): install.packages(reshape) library(reshape) names(mydf) - tolower(names(mydf)) cast(mydf, item ~ step, length) cast(mydf, item ~ step, function(x) x[1]) Hadley -- http://had.co.nz/ __ 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.
Re: [R] Transform values from one column into column names of new dataframe
Try this also: noquote(with(x, tapply(VALUE, list(ITEM, STEP), paste))) On Fri, May 2, 2008 at 1:05 PM, Matt [EMAIL PROTECTED] wrote: Hi, I have a question about reformatting data. It looks like it should be simple, but I've been working at it for awhile now and it's about time I ask for help. My data look like this: ITEM VALUE STEP item1 A first item2 C first item2 D second item1 A second item3 A first item3 B second item3 A third I just want to transform it so they look like this: ITEM FIRST SECOND THIRD item1 A ANA item2 C DNA item3 A BA Basically taking the values of the STEP column and using those as the column names and merging together the items. I appreciate your help, -Matt __ 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. -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40 S 49° 16' 22 O [[alternative HTML version deleted]] __ 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.
