[R] reading in a (very simple) list from a file
Apologies - I feel this is a very simple thing to do yet I am failing massively. I keep finding information about how to do much more complicated things (usually on this mailing list!), which then fail when I try to apply it to my simple task. Anyway, all I want to do is read in a series of key-value pairs from a file. I thought a list would be a good way to keep these, such that I could access them like: listname$key I was imagining a file like this: key1 value1 key2 value2 key3 value3 ... (the keys will always be character strings, the values might be other types, but they will always be single items) I won't bore you with all the things I've tried. I'm sure I'm overlooking something basic and simple, but I would greatly appreciate it if someone could help me out here. Thank you. Best wishes, Anne -- View this message in context: http://r.789695.n4.nabble.com/reading-in-a-very-simple-list-from-a-file-tp4645741.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] reading in a (very simple) list from a file
Brilliant! Thank you both, this works! Combined with the other suggestion of setting stringsAsFactors to FALSE when reading in the data frame, I now have the behaviour I wanted. I had been beginning to get the sense that one of the apply functions was the solution. I will now do some reading on split to understand precisely what I'm doing... Best wishes, Anne -- View this message in context: http://r.789695.n4.nabble.com/reading-in-a-very-simple-list-from-a-file-tp4645741p4645839.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] reading in a (very simple) list from a file
Hi again! Just in case someone ends up googling this for the same thing I
did, here is a modification to get around a little problem:
dat1<-data.frame(keys=paste("key",5:1,sep=""),value=1:5)
splitlist <- split(dat1,dat1$keys)
list3<-sapply(splitlist,`[`,2)
names(list3)<-names(splitlist)
list3$key2
[1] 4
Because the list after split is stored in alphabetical order by name, it
reorders things, so you need to use that order when you name it.
Thanks again,
Anne
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