One additionnal question about a problem that I just noticed in my script: the list created by my split function is sorted in the increasing order and not in the current order of the elements of the do.call argument (see the results of the two last lines of the following script). I was unsuccesful in tweaking my split function to have a proper order... If there is no way to do that, I guess it comes down to a very basic question: how can I reorder a list ?
#### how can I reorder the list 'mydata.split' according to a<-rep(1.5:10.5,each=2) b<-rep(21:30,each=2) cd<-101:120 mydata<-data.frame(a,b,cd) mydata.split <- split(mydata,do.call(paste,c(mydata[,1:2],sep = ":")),drop=TRUE) names(mydata.split) unique(do.call(paste,c(mydata[,1:2],sep = ":"))) #### Sebastien Gabor Grothendieck a écrit : > Try this using the BOD data frame that comes with R or > try using interaction in place of paste: > > split(BOD, do.call(paste, c(BOD, sep = ":")), drop=TRUE) > > > On Nov 25, 2007 10:23 AM, <[EMAIL PROTECTED]> wrote: > >> Thanks Jim and Herinque for you reply. >> >> The substitution you are both proposing works fine, except when a or b >> contains >> decimal numbers (which is mostly my case in a real dataset). In this case, >> there >> is no distinction between the decimal point and the one introduced by the >> split >> function. >> If the split function cannot be customized, then I guess I have to first >> substitute the decimal point in my dataset by e.g. a * sign and change it >> back >> to a . when the split is done... >> >> Sebastien >> >> jim holtman a écrit : >> >> >>> Here is one way: >>> >>> >>>> a<-1:10 >>>> b<-21:30 >>>> mydata<-data.frame(a,b) >>>> mydata.split<-split(mydata,(mydata[,1:2]),drop=TRUE) >>>> x <- mydata.split >>>> # customize the names >>>> names(x) <- sapply(strsplit(names(x), "\\."), paste, collapse="-my >>>> >> character-") >> >>>> x >>>> >>> $`1-my character-21` >>> a b >>> 1 1 21 >>> >>> $`2-my character-22` >>> a b >>> 2 2 22 >>> >>> $`3-my character-23` >>> a b >>> 3 3 23 >>> ........... >>> >>> On Nov 24, 2007 6:15 PM, <[EMAIL PROTECTED]> wrote: >>> >>>> Dear R-users, >>>> >>>> The following code splits a very simple dataframe into a list, each element >>>> >> of >> >>>> the list being one line of the dataframe. You will see that the split >>>> >> function >> >>>> names each element of the list by using uses the content of a and b and >>>> >> merging >> >>>> them with a "." character. Is there a way to customize this character? >>>> >>>> a<-1:10 >>>> b<-21:30 >>>> mydata<-data.frame(a,b) >>>> mydata.split<-split(mydata,(mydata[,1:2]),drop=TRUE) >>>> mydata.split >>>> >>>> Thanks in advance for your help. >>>> >>>> Sebastien >>>> >>>> ______________________________________________ >>>> 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. >> >> > > > [[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.
